You should provide context. The common translations are "Tôi bị lạc mất rồi" or "Tôi không hiểu anh đang nói gì." If you use either sentence not properly, no one would understand what you mean. There are other translations as well. Each of the following meanings has it own translation in Vietnamese. lost lost /lɒst/ US /lɑːst/ adjective 1 not knowing where you are and how to get to a place: I got lost in the London Underground. You look lost - can I help you?
2 If something is lost, no one knows where it is: Things tend to get lost when you move house. Lost: black cat with white paws. Mikey turned up with the lost book.
3 not knowing what to do in a new situation: It was his first day in the office and he seemed a bit lost.
4 giving so much attention to what you are doing that you are not aware of anything else that is happening around you: Ann was completely lost in her book.
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