Perhaps you should try some spelling variations:
quang doan » quan doan, quang hoan, quang hoang
quang toan » quang tuan, quang tran, quang hoan
tinh dung » trinh dung, tin dung, tinh quang
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
dung lan » dung luan, dung land, dung lam
van hieu » cao hieu
lan van » luan van, lang van, tan van
va kiem » van kien

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 lan van hieu suat ) OR ( tinh ((quang toan) OR (quang doan)) va kiem soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung lan van hieu suat ) or ( tinh ((quang toan) OR (quang doan)) va kiem soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung lan van hieu suat ) or ( tinh ((quang toan) OR (quang doan)) va kiem soat ))*.