Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
kiem soat » kiem toan
tinh quan » tinh quang, trinh quan, sinh quan
hieu suat » hieu luat, hieu qua
van kiem » va kiem, van kien, van hieu
tin quan » tinh quang, trinh quan, lien quan
van cao » van dao, van bao, van hao
luan » lan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van kiem soat ) OR ( ((tinh quan) OR (tin quan)) van cao hieu suat ))~.
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van kiem soat ) or ( ((tinh quan) or (tin quan)) van cao hieu suat ))*.