phát minh quan trọng 
important discovery [ phát ] : to distribute, send out, become; [CL for gunshots, abrupt actions]
[ minh ] : bright, clear; oath, alliance; Ming (1368-1644, last native Chinese dynasty in the history of China)
[ 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 :