sự quan trọng 
importance [ sự ] : deed, act, action event, occurrence, (classifier for actions, states)
[ quan ] : (1) official, officer; (2) franc (unit of currency); (3) coffin; (4) sense
[ trọng ] : heavy, important; to think high of, hold in esteem
Most Common Compounds Set 1:
Most Common Compounds Set 2 :