like: đại sự
Intermediate Level Advanced Level
Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
đại sự * ☊ 
great work, important business * ☊
[ đại ] : (1) large, big, great, very, much; (2) period, era
[ sự ] : deed, act, action event, occurrence, (classifier for actions, states)