vô thời hạn 
till doomsday, sine die, indefinitely [ vô ] : (1) in-, im-, (negative prefix); (2) in, at, on; (3) to go into, enter [= vào]
[ thời ] : time(s), era
[ hạn ] : deadline, expiration date
Most Common Compounds Set 1:
Most Common Compounds Set 2:
Most Common Compounds Set 3 :
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