like: sự cải thiện
Intermediate Level Advanced Level
Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
sự cải thiện * ☊ 
improvement * ☊
[ sự ] : deed, act, action event, occurrence, (classifier for actions, states)
[ cải ] : (1) to change, reform, tap; (2) cabbage
[ thiện ] : good, kind, virtuous
OXF3000: 
sự cải thiện 
improvement