không thể thiếu được 
indispensable [ không ] : (1) no, not; (question tag); (2) air; (3) empty
[ thể ] : (1) body, group; (2) ability, capability; (3) card
[ thiếu ] : to be insufficient, lack, owe (sb money for sth); deficit, shortage, deficiency; minus
[ được ] : (passive marker); can, be able, okay; that, which; to have, receive, obtain; to defeat, beat
Most Common Compounds Set 1:
Most Common Compounds Set 2 :