like: biến cố quan trọng
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Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
biến cố quan trọng * ☊ 
important event, occurrence * ☊
[ biến ] : (1) to disappear, vanish; (2) to change, convert; variable; (3) catastrophe, disaster, calamity; (4) to spread, distribute
[ cố ] : (1) to make an effort, try (very hard); (2) great grandfather; (3) to pawn; (4) reason; (5) old, former, late (deceased); (6) intentional, premeditated; (7) firm, strong; (8) innate, original; (9) to look after, care for, turn one’s head
[ quan ] : (1) official, officer; (2) franc (unit of currency); (3) coffin; (4) sense
[ trọng ] : heavy, important; to think high of, hold in esteem