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Từ điển Oxford Advanced Learner 8th 
	
		  not have a clue   
  not have a ˈclue idiom   (informal)  1. to know nothing about sth or about how to do sth   •I don't have a clue where she lives.   2. (disapproving)to be very stupid   •Don't ask him to do it— he doesn't have a clue!     Main entry: ↑clueidiom
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