tu nghiệp 
in-service training, on the job training [ tu ] : (1) to drink straight out of a container; (2) to blush, be embarassed; (3) to enter a religion; (4) to repair; (5) beard
[ nghiệp ] : trade, profession; karma
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
lớp tu nghiệp refresher course, seminar, workshop