Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh han
tinh dung » trinh dung, tin dung, tinh quang
hieu luat » hieu qua
kiem soat » kiem toan
van hieu » cao hieu
van kiem » va kiem, van kien, van hien
san van » tan van, tran van, dang 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 hieu luat ) OR ( ((trinh quan) OR (trinh luat)) san van kiem soat ))~.
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu luat ) or ( ((trinh quan) or (trinh luat)) san van kiem soat ))*.