RẤT HỮU DỤNG : Ý nghĩa của các chữ viết tắt trên Internet

You should try to learn some of them for your ease of communication.

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https://www.youtube.com/watch?time_continue=435&v=qc9MKSmc6wY&feature=emb_logo  

These texting terms are only used in very informal situations online or in texts and are more often used by younger people.