“Yet” can be used as a stand-in for “in addition.” It is often used in a negative statement to discuss another thing the speaker has to deal with or address. For example, you may say, “Yet another source of trouble,” or, “Yet another issue to deal with.” Similar to terms like “even,” “still,” or “more,” “yet” can be used to stress a point or create a more vivid image. It usually appears before terms like “another” or “again.” For example, you may say, “My mother served her yet another piece of pie,” or, “The coffee machine broke down yet again.” You can also use “yet” as a superlative to let others know how thrilled you are.  For example, you may say, “That was her best film yet!” or, “That was her greatest performance yet!” You may also say, “A time of 3 hours and 10 minutes, his best marathon yet!”

TL;DR in Vietnamese:
Sử dụng từ “yet” để chỉ ra các vấn đề khác. Đặt từ “yet” trong câu để nhấn mạnh. Đặt từ “yet” vào cuối câu để thể hiện sự nhiệt tình hoặc phấn khích.