tại ngoại hậu cứu 
to be out on [ tại ] : at, in; because (of)
[ ngoại ] : foreign, imported, maternal side; over, past
[ hậu ] : after, behind, back, rear
[ cứu ] : (1) to save, rescue, deliver, relieve; (2) to study, research, examine, investigate
Most Common Compounds Set 1:
Most Common Compounds Set 2 :