like: trau dồi tiếng Việt
Intermediate Level Advanced Level
Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
trau dồi tiếng Việt * ☊ 
to polish up, improve one’s Vietnamese * ☊
[ trau ] : to polish
[ tiếng ] : (1) language, sound, voice, reputation; (2) hour
[ Việt ] : Vietnamese