Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh huong
hieu soat » hieu suat, hieu hoat, hieu luat
quang uan » quang tuan, quang ban, quang tran
kiem soat » kiem toan
quan van » quan va, quan luan, quan doan
van kiem » va kiem, van kien, van hieu
uan van » tan van, san van, van van
luan » lan

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

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