Mang nghĩa"nếu tôi không nhầm thì"
=You use expressions such as if I'm not mistaken and unless I'm very much mistaken as a polite way of emphasizing the statement you are making, especially when you are confident that it is correct.
- If I am not mistaken, this must be yours. (IELTS TUTOR giải thích: Nếu tôi không nhầm thì cái này là của bạn)
- I think he wanted to marry her, if I am not mistaken.
- Unless I'm mistaken, he didn't specify what time.