First, read the English article below.

Make sure your Bluetooth accessory is fully charged and turned on before attempting to pair. Depending on the accessory, you may have to press a button or activate a switch to power it on. Make sure your Bluetooth accessory and the iPhone are within close range. The range may vary by accessory, but no more than 30 feet apart is recommended. The accessory must be in pairing mode so that your iPhone can detect it. Some accessories automatically go into pairing mode when turned on, while others require you to press a button or select an option from a menu. You can usually figure out if an accessory is in pairing mode by checking the behavior of an LED light. For example, sometimes a light will blink on a device when it's ready for pairing.  If you're not sure how to enable pairing mode, check the device's manual. "Pairing mode" is sometimes referred to "discover mode" or "making the device discoverable." If you're using an iPhone X or later, swipe down from the top-right corner of the home screen. On earlier iPhones, swipe up from the bottom of the home screen. A pop-up screen with more icons will appear. If you see the word "Off" below the "Bluetooth" icon, tap the icon once to turn it on. Bluetooth is enabled once the icon turns blue. If you don't see this option, you may be using an older version of iOS. To pair your accessory, open the Settings, select Bluetooth option, and slide the "Bluetooth" switch to the On (green position). Then, skip to Step 8. This time, your iPhone will scan for nearby accessories in pairing mode and display them in a list. If a pairing password is not required, you should be able to start using your Bluetooth accessory with the iPhone immediately. If you are prompted to enter a password, the password may be in your accessory's manual (or on its screen, if there is one). Common factory-generated passwords include 0000, 1111, and 1234. If you can't find a password, try one of these.  Now that the accessory is paired, it will always appear as a pairing option in your Bluetooth... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Bật phụ kiện Bluetooth. Đặt phụ kiện ở chế độ kết nối. Mở Control Center (Trung tâm kiểm soát) của iPhone. Chạm và giữ biểu tượng Bluetooth. Chạm vào Bluetooth để bật (nếu chế độ này đang tắt). Chạm và giữ biểu tượng Bluetooth. Chạm vào tên phụ kiện để bắt đầu kết nối.