Mở WhatsApp. Nhấn Settings (Cài đặt). Nhấn Account (Tài khoản). Nhấn Privacy (Quyền riêng tư). Trượt Read Receipts (Thông báo đã đọc) sang vị trí "Off" (Tắt) (bên trái).

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
It's the green app with a white phone and chat bubble icon. If this is your first time opening WhatsApp, you'll need to set up WhatsApp. It's in the bottom-right corner of the screen. If WhatsApp opens to a conversation, first tap the back button in the top-left corner of the screen. It's near the top of the page. This option is at the top of the "Account" page. This green switch is at the bottom of the screen; sliding it left will disable read receipts in non-group conversations, which will in