like: sai lầm nghiêm trọng
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Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
sai lầm nghiêm trọng * ☊ 
a serious mistake * ☊
[ sai ] : (1) to order, command; (2) wrong, incorrect, off by
[ lầm ] : wrong, mistaken
[ nghiêm ] : grave, strict, severe, stern, solemn; Attention!
[ trọng ] : heavy, important; to think high of, hold in esteem
[ sai ] : wrong
[ sai ] : wrongly
[ lầm ] : mistaken