like: thắc mắc
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Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
thắc mắc * ☊ 
(1) worried, anxious, uneasy, uncomfortable, ill at ease; worry, concern; (2) a question * ☊
[ mắc ] : (1) to be expensive; (2) to be caught (in a trap, disaster), hang on a peg