diff --git a/app/api/account.py b/app/api/account.py
index 318e268..446076b 100644
--- a/app/api/account.py
+++ b/app/api/account.py
@@ -20,7 +20,7 @@ def get_user_api(user_id: str):
     raise HTTPException(status_code=404, detail="Không tìm thấy userId")
 
 @router.get("/account", response_model=AccountResponseSchema, tags=["Account"])
-def get_account_info(userId: str = Query(..., description="ID của user để lấy API key/secret")):
+def get_account_info(userId: str = Query(..., description="User ID to get API key/secret")):
     try:
         api_key, api_secret = get_user_api(userId)
         client = get_bybit_client(api_key, api_secret)
@@ -31,4 +31,4 @@ def get_account_info(userId: str = Query(..., description="ID của user để l
     except HTTPException as e:
         raise e
     except Exception as e:
-        raise HTTPException(status_code=500, detail=f"Lỗi hệ thống: {e}")
+        raise HTTPException(status_code=500, detail=f"System error: {e}")
diff --git a/app/api/candles.py b/app/api/candles.py
index bea9e94..0fc1028 100644
--- a/app/api/candles.py
+++ b/app/api/candles.py
@@ -45,17 +45,17 @@ def rsi(series, period=14):
 
 @router.get("/candles", response_model=CandleResponseSchema, response_model_exclude_none=True, tags=["Candle"])
 def get_candles(
-    userId: str = Query(..., description="ID của user để lấy API key/secret"),
-    symbol: str = Query(..., description="Mã giao dịch, ví dụ: BTCUSDT"),
-    interval: str = Query("1", description="Khung thời gian nến, ví dụ: 1, 3, 5, 15, 30, 60, 240, D, W, M"),
-    limit: Optional[int] = Query(200, description="Số lượng nến trả về (tối đa 1000)"),
-    start: Optional[int] = Query(None, description="Timestamp bắt đầu (miliseconds)"),
-    end: Optional[int] = Query(None, description="Timestamp kết thúc (miliseconds)")
+    userId: str = Query(..., description="User ID to get API key/secret"),
+    symbol: str = Query(..., description="Trading symbol, e.g. BTCUSDT"),
+    interval: str = Query("1", description="Candle interval, e.g. 1, 3, 5, 15, 30, 60, 240, D, W, M"),
+    limit: Optional[int] = Query(200, description="Number of candles to return (max 1000)"),
+    start: Optional[int] = Query(None, description="Start timestamp (milliseconds)"),
+    end: Optional[int] = Query(None, description="End timestamp (milliseconds)")
 ):
     api_key, api_secret = get_user_api(userId)
     client = get_bybit_client(api_key, api_secret)
     params = {
-        "category": "linear",  # hoặc "spot" nếu lấy spot
+        "category": "linear",  # or "spot" for spot
         "symbol": symbol,
         "interval": interval,
         "limit": limit
@@ -70,7 +70,7 @@ def get_candles(
     candles = res.get('result', {}).get('list', [])
     if not candles:
         return {"data": [], "indicators": {}}
-    # Chuyển đổi sang DataFrame
+    # Convert to DataFrame
     df = pd.DataFrame(candles, columns=[
         "timestamp", "open", "high", "low", "close", "volume", "turnover"
     ])
@@ -84,7 +84,7 @@ def get_candles(
         "turnover": np.float64
     })
     df = df.sort_values("timestamp", ascending=False)
-    # Tính chỉ báo
+    # Calculate indicators
     close = df["close"]
     macd_line, macd_signal, macd_hist = macd(close, fast=45, slow=90, signal=9)
     df["macd"] = macd_line
@@ -95,7 +95,7 @@ def get_candles(
     df["ema100"] = ema(close, 100)
     df["ema200"] = ema(close, 200)
     df["rsi"] = rsi(close)
-    # Trả về kết quả
+    # Return result
     data = df.replace({np.nan: None}).to_dict(orient="records")
     return {
         "data": data,
diff --git a/app/api/orders.py b/app/api/orders.py
index 2e945c0..55a8d7e 100644
--- a/app/api/orders.py
+++ b/app/api/orders.py
@@ -21,14 +21,14 @@ def get_user_api(user_id: str):
 
 @router.get("/orders", tags=["Order"])
 def get_orders(
-    userId: str = Query(..., description="ID của user để lấy API key/secret"),
-    symbol: str = Query(..., description="Mã giao dịch, ví dụ: BTCUSDT"),
-    category: str = Query("linear", description="Loại lệnh: linear (future) hoặc spot")
+    userId: str = Query(..., description="User ID to get API key/secret"),
+    symbol: str = Query(..., description="Trading symbol, e.g. BTCUSDT"),
+    category: str = Query("linear", description="Order type: linear (future) or spot")
 ):
     api_key, api_secret = get_user_api(userId)
     client = get_bybit_client(api_key, api_secret)
     res = client.get_open_orders(
-        category=category,  # "linear" cho future, "spot" cho spot
+        category=category,  # "linear" for future, "spot" for spot
         symbol=symbol
     )
     return res
@@ -36,13 +36,13 @@ def get_orders(
 # Submit order
 @router.post("/orders", tags=["Order"])
 def submit_order(
-    userId: str = Body(..., embed=True, description="ID của user để lấy API key/secret"),
-    symbol: str = Body(..., embed=True, description="Mã giao dịch, ví dụ: BTCUSDT"),
-    side: str = Body(..., embed=True, description="side: Buy hoặc Sell"),
-    orderType: str = Body(..., embed=True, description="Loại lệnh: Market hoặc Limit"),
-    qty: float = Body(..., embed=True, description="Số lượng"),
-    category: str = Body("linear", embed=True, description="Loại lệnh: linear (future) hoặc spot"),
-    price: Optional[float] = Body(None, embed=True, description="Giá (bắt buộc với Limit)")
+    userId: str = Body(..., embed=True, description="User ID to get API key/secret"),
+    symbol: str = Body(..., embed=True, description="Trading symbol, e.g. BTCUSDT"),
+    side: str = Body(..., embed=True, description="Order side: Buy or Sell"),
+    orderType: str = Body(..., embed=True, description="Order type: Market or Limit"),
+    qty: float = Body(..., embed=True, description="Order quantity"),
+    category: str = Body("linear", embed=True, description="Order type: linear (future) or spot"),
+    price: Optional[float] = Body(None, embed=True, description="Order price (required for Limit)")
 ):
     api_key, api_secret = get_user_api(userId)
     client = get_bybit_client(api_key, api_secret)
@@ -55,7 +55,7 @@ def submit_order(
     }
     if orderType.lower() == "limit":
         if price is None:
-            raise HTTPException(status_code=400, detail="Thiếu giá cho lệnh Limit")
+            raise HTTPException(status_code=400, detail="Missing price for Limit order")
         params["price"] = price
     res = client.place_order(**params)
     return res
@@ -64,9 +64,9 @@ def submit_order(
 @router.delete("/orders/{order_id}", tags=["Order"])
 def cancel_order(
     order_id: str,
-    userId: str = Query(..., description="ID của user để lấy API key/secret"),
-    symbol: str = Query(..., description="Mã giao dịch, ví dụ: BTCUSDT"),
-    category: str = Query("linear", description="Loại lệnh: linear (future) hoặc spot")
+    userId: str = Query(..., description="User ID to get API key/secret"),
+    symbol: str = Query(..., description="Trading symbol, e.g. BTCUSDT"),
+    category: str = Query("linear", description="Order type: linear (future) or spot")
 ):
     api_key, api_secret = get_user_api(userId)
     client = get_bybit_client(api_key, api_secret)
diff --git a/app/api/positions.py b/app/api/positions.py
index ed38522..16f9140 100644
--- a/app/api/positions.py
+++ b/app/api/positions.py
@@ -21,9 +21,9 @@ def get_user_api(user_id: str):
 
 @router.get("/positions", tags=["Position"])
 def get_positions(
-    userId: str = Query(..., description="ID của user để lấy API key/secret"),
-    symbol: Optional[str] = Query(None, description="Mã giao dịch, ví dụ: BTCUSDT"),
-    category: str = Query("linear", description="Loại lệnh: linear (future) hoặc spot")
+    userId: str = Query(..., description="User ID to get API key/secret"),
+    symbol: Optional[str] = Query(None, description="Trading symbol, e.g. BTCUSDT"),
+    category: str = Query("linear", description="Order type: linear (future) or spot")
 ):
     api_key, api_secret = get_user_api(userId)
     client = get_bybit_client(api_key, api_secret)
diff --git a/app/api/user/user.py b/app/api/user/user.py
index 35c84ef..596bb71 100644
--- a/app/api/user/user.py
+++ b/app/api/user/user.py
@@ -15,21 +15,21 @@ def list_users():
             accounts = json.load(f)
         return accounts
     except Exception as e:
-        raise HTTPException(status_code=500, detail=f"Lỗi đọc file accounts: {e}")
+        raise HTTPException(status_code=500, detail=f"Error reading accounts file: {e}")
 
 # API thêm user
 @router.post("/users", tags=["User"])
 def add_user(
-    id: str = Body(..., description="ID user"),
+    id: str = Body(..., description="User ID"),
     bybit_api_key: str = Body(..., description="Bybit API Key"),
     bybit_api_secret: str = Body(..., description="Bybit API Secret"),
-    user_name: str = Body(..., description="Tên user")
+    user_name: str = Body(..., description="User name")
 ):
     try:
         with open(ACCOUNTS_FILE, 'r+', encoding='utf-8') as f:
             accounts = json.load(f)
             if any(acc['id'] == id for acc in accounts):
-                raise HTTPException(status_code=400, detail="ID đã tồn tại")
+                raise HTTPException(status_code=400, detail="ID already exists")
             new_user = {
                 "id": id,
                 "bybit_api_key": bybit_api_key,
@@ -40,11 +40,11 @@ def add_user(
             f.seek(0)
             json.dump(accounts, f, ensure_ascii=False, indent=2)
             f.truncate()
-        return {"message": "Thêm user thành công"}
+        return {"message": "User added successfully"}
     except HTTPException as e:
         raise e
     except Exception as e:
-        raise HTTPException(status_code=500, detail=f"Lỗi ghi file accounts: {e}")
+        raise HTTPException(status_code=500, detail=f"Error writing accounts file: {e}")
 
 # API sửa user
 @router.put("/users/{user_id}", tags=["User"])
@@ -68,12 +68,12 @@ def update_user(
                     f.seek(0)
                     json.dump(accounts, f, ensure_ascii=False, indent=2)
                     f.truncate()
-                    return {"message": "Cập nhật user thành công"}
-            raise HTTPException(status_code=404, detail="Không tìm thấy userId")
+                    return {"message": "User updated successfully"}
+            raise HTTPException(status_code=404, detail="User ID not found")
     except HTTPException as e:
         raise e
     except Exception as e:
-        raise HTTPException(status_code=500, detail=f"Lỗi ghi file accounts: {e}")
+        raise HTTPException(status_code=500, detail=f"Error writing accounts file: {e}")
 
 # API xóa user
 @router.delete("/users/{user_id}", tags=["User"])
@@ -83,12 +83,12 @@ def delete_user(user_id: str):
             accounts = json.load(f)
             new_accounts = [acc for acc in accounts if acc['id'] != user_id]
             if len(new_accounts) == len(accounts):
-                raise HTTPException(status_code=404, detail="Không tìm thấy userId")
+                raise HTTPException(status_code=404, detail="User ID not found")
             f.seek(0)
             json.dump(new_accounts, f, ensure_ascii=False, indent=2)
             f.truncate()
-        return {"message": "Xóa user thành công"}
+        return {"message": "User deleted successfully"}
     except HTTPException as e:
         raise e
     except Exception as e:
-        raise HTTPException(status_code=500, detail=f"Lỗi ghi file accounts: {e}") 
\ No newline at end of file
+        raise HTTPException(status_code=500, detail=f"Error writing accounts file: {e}") 
\ No newline at end of file
diff --git a/app/schemas/account.py b/app/schemas/account.py
index 278e052..379bb5a 100644
--- a/app/schemas/account.py
+++ b/app/schemas/account.py
@@ -2,45 +2,45 @@ from pydantic import BaseModel, Field
 from typing import List, Optional, Dict, Any
 
 class CoinInfo(BaseModel):
-    availableToBorrow: Optional[str] = Field(None, description="Số lượng có thể vay")
-    bonus: Optional[str] = Field(None, description="Tiền thưởng")
-    accruedInterest: Optional[str] = Field(None, description="Lãi tích lũy")
-    availableToWithdraw: Optional[str] = Field(None, description="Số lượng có thể rút")
-    totalOrderIM: Optional[str] = Field(None, description="Initial margin cho lệnh")
-    equity: Optional[str] = Field(None, description="Tổng tài sản coin")
-    totalPositionMM: Optional[str] = Field(None, description="Maintenance margin cho vị thế")
-    usdValue: Optional[str] = Field(None, description="Giá trị USD của coin")
-    unrealisedPnl: Optional[str] = Field(None, description="Lãi/lỗ chưa chốt")
-    collateralSwitch: Optional[bool] = Field(None, description="Có dùng làm tài sản thế chấp không")
-    spotHedgingQty: Optional[str] = Field(None, description="Số lượng spot hedging")
-    borrowAmount: Optional[str] = Field(None, description="Số lượng đã vay")
-    totalPositionIM: Optional[str] = Field(None, description="Initial margin cho vị thế")
-    walletBalance: Optional[str] = Field(None, description="Số dư ví coin")
-    cumRealisedPnl: Optional[str] = Field(None, description="Lãi/lỗ đã chốt tích lũy")
-    locked: Optional[str] = Field(None, description="Số lượng bị khóa")
-    marginCollateral: Optional[bool] = Field(None, description="Có dùng làm tài sản margin không")
-    coin: str = Field(..., description="Mã coin")
+    availableToBorrow: Optional[str] = Field(None, description="Amount available to borrow")
+    bonus: Optional[str] = Field(None, description="Bonus amount")
+    accruedInterest: Optional[str] = Field(None, description="Accrued interest")
+    availableToWithdraw: Optional[str] = Field(None, description="Amount available to withdraw")
+    totalOrderIM: Optional[str] = Field(None, description="Initial margin for orders")
+    equity: Optional[str] = Field(None, description="Total coin equity")
+    totalPositionMM: Optional[str] = Field(None, description="Maintenance margin for positions")
+    usdValue: Optional[str] = Field(None, description="USD value of the coin")
+    unrealisedPnl: Optional[str] = Field(None, description="Unrealized PnL")
+    collateralSwitch: Optional[bool] = Field(None, description="Is used as collateral")
+    spotHedgingQty: Optional[str] = Field(None, description="Spot hedging quantity")
+    borrowAmount: Optional[str] = Field(None, description="Borrowed amount")
+    totalPositionIM: Optional[str] = Field(None, description="Initial margin for positions")
+    walletBalance: Optional[str] = Field(None, description="Coin wallet balance")
+    cumRealisedPnl: Optional[str] = Field(None, description="Cumulative realized PnL")
+    locked: Optional[str] = Field(None, description="Locked amount")
+    marginCollateral: Optional[bool] = Field(None, description="Is used as margin collateral")
+    coin: str = Field(..., description="Coin symbol")
 
 class AccountInfo(BaseModel):
-    totalEquity: str = Field(..., description="Tổng tài sản quy USD")
+    totalEquity: str = Field(..., description="Total equity in USD")
     accountIMRate: str = Field(..., description="Initial margin rate")
-    totalMarginBalance: str = Field(..., description="Tổng margin balance")
-    totalInitialMargin: str = Field(..., description="Tổng initial margin")
-    accountType: str = Field(..., description="Loại tài khoản (ví dụ: UNIFIED)")
-    totalAvailableBalance: str = Field(..., description="Tổng số dư khả dụng")
+    totalMarginBalance: str = Field(..., description="Total margin balance")
+    totalInitialMargin: str = Field(..., description="Total initial margin")
+    accountType: str = Field(..., description="Account type (e.g. UNIFIED)")
+    totalAvailableBalance: str = Field(..., description="Total available balance")
     accountMMRate: str = Field(..., description="Maintenance margin rate")
-    totalPerpUPL: str = Field(..., description="Lãi/lỗ chưa chốt của perpetual")
-    totalWalletBalance: str = Field(..., description="Tổng số dư ví")
+    totalPerpUPL: str = Field(..., description="Unrealized PnL of perpetual positions")
+    totalWalletBalance: str = Field(..., description="Total wallet balance")
     accountLTV: str = Field(..., description="Loan to value")
-    totalMaintenanceMargin: str = Field(..., description="Tổng maintenance margin")
-    coin: List[CoinInfo] = Field(..., description="Danh sách coin")
+    totalMaintenanceMargin: str = Field(..., description="Total maintenance margin")
+    coin: List[CoinInfo] = Field(..., description="List of coins")
 
 class ResultInfo(BaseModel):
-    list: List[AccountInfo] = Field(..., description="Danh sách tài khoản")
+    list: List[AccountInfo] = Field(..., description="List of accounts")
 
 class AccountResponseSchema(BaseModel):
-    retCode: int = Field(..., description="Mã kết quả trả về (0 là thành công)")
-    retMsg: str = Field(..., description="Thông báo kết quả")
-    result: ResultInfo = Field(..., description="Kết quả chi tiết")
-    retExtInfo: Dict[str, Any] = Field(..., description="Thông tin mở rộng")
-    time: int = Field(..., description="Timestamp trả về") 
\ No newline at end of file
+    retCode: int = Field(..., description="Return code (0 means success)")
+    retMsg: str = Field(..., description="Return message")
+    result: ResultInfo = Field(..., description="Detailed result")
+    retExtInfo: Dict[str, Any] = Field(..., description="Extra information")
+    time: int = Field(..., description="Response timestamp") 
\ No newline at end of file
diff --git a/app/schemas/candle.py b/app/schemas/candle.py
index ac46bd3..14c9a02 100644
--- a/app/schemas/candle.py
+++ b/app/schemas/candle.py
@@ -2,13 +2,13 @@ from pydantic import BaseModel, Field
 from typing import List, Optional, Any
 
 class CandleSchema(BaseModel):
-    timestamp: int = Field(..., description="Thời gian (miliseconds)")
-    open: float = Field(..., description="Giá mở cửa")
-    high: float = Field(..., description="Giá cao nhất")
-    low: float = Field(..., description="Giá thấp nhất")
-    close: float = Field(..., description="Giá đóng cửa")
-    volume: float = Field(..., description="Khối lượng giao dịch")
-    turnover: float = Field(..., description="Giá trị giao dịch")
+    timestamp: int = Field(..., description="Timestamp (milliseconds)")
+    open: float = Field(..., description="Open price")
+    high: float = Field(..., description="High price")
+    low: float = Field(..., description="Low price")
+    close: float = Field(..., description="Close price")
+    volume: float = Field(..., description="Volume")
+    turnover: float = Field(..., description="Turnover value")
     macd: Optional[float] = Field(None, description="MACD value")
     macdsignal: Optional[float] = Field(None, description="MACD signal")
     macdhist: Optional[float] = Field(None, description="MACD histogram")