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 soat » hieu suat, hieu hoat, hieu luat
van kiem » va kiem, van kien, van hien
tin quan » tinh quang, trinh quan, lien quan
van hieu » cao hieu
van van » van ban, tan van, san van
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 van hieu soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung luan van kiem soat ) or ( ((tinh quan) OR (tin quan)) van van hieu soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van kiem soat ) or ( ((tinh quan) OR (tin quan)) van van hieu soat ))*.