Not every broker will allow you to use this strategy. Likewise, not all types of accounts will permit a trailing stop loss order. Be sure to check if your broker allows this type of transaction. It is highly recommended that you have the option to use this order. It is helpful to understand the historical volatility and price movements of your stock. This will give you an idea of how much the stock moves up or down in a given period of time. Use this to determine a reasonable trail value that balances between triggering a premature sale and leaving too much profit on the table. You can place a trailing stop loss order anytime. You can do this immediately after the initial purchase. You can also track your stock and decide to put in the trailing stop loss order later on. As noted, a trailing stop loss can be created in one of two ways. You can either use a fixed price or a relative one based on a percentage.  For example, you can determine either a strict dollar amount (e.g., $10) for the trail or a percentage of the stock’s value (e.g., 5%). In either case, the “trail” is related to the value of the stock. This trail changes over time as the price of the stock changes. By using the fixed-dollar option, you limit to a strict dollar value the amount the stock can go down from its highest point before a sell order is automatically placed. Dollar amounts cannot have more than two decimal places (in other words, no tenths of a cent.)  By using a percentage approach, you can define the appropriate range to allow the stock to go up and down while in a generally rising trend. Percentages used must be between 1% and 30% of the current price.  Know the risk. The risk with any stop loss is that the stock may dip below the sell point and trigger a sale. Then the stock may reverse and go  back up, leaving you behind without the newly accrued profit. Figure out how much you’d like your trailing stop loss to be. Talk with your broker to determine an appropriate dollar amount or percentage for your trailing stop loss order. ...

How would you rephrase that briefly using Vietnamese?
Tìm hiểu liệu rằng bạn có thể dùng lệnh cắt lỗ dưới hay không. Theo dõi lịch sử biến động của loại cổ phiếu bạn đang đầu tư. Chọn thời điểm đặt lệnh. Chọn mức giá cố định hoặc tương đối. Xác định giá trị dịch chuyển hợp lý. Xác định bạn muốn lệnh có giá trị trong ngày hay lệnh GTC. Lựa chọn giữ lệnh thị trường và lệnh giới hạn. Lệnh thị trường là lệnh mặc định.