Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
hieu soat » hieu suat, hieu hoat, hieu luat
quang tan » quang tuan, quang tran, quang toan
kiem soat » kiem toan
quan van » luan van, quan va, quan doan
van kiem » va kiem, van kien, van hieu
tan van » tran van, tang van, luan van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh luong ((quan van) OR (quan luan)) hieu soat ) or ( tinh quang tan van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh luong ((quan van) OR (quan luan)) hieu soat ) OR ( tinh quang tan van kiem soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh luong ((quan van) OR (quan luan)) hieu soat ) or ( tinh quang tan van kiem soat ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh luong ((quan van) OR (quan luan)) hieu soat ) or ( tinh quang tan van kiem soat ))*.