like: hệ thống vận hành
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Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
hệ thống vận hành * ☊ 
operating system * ☊
[ hệ ] : branch, system; generation
[ vận ] : to move
[ hành ] : (1) scallion, spring onion; (2) to act, execute, carry out; (3) stem; (4) to go, travel (on foot); (5) one of the five elements