Perhaps you should try some spelling variations:
quan quang » qua quang, quan quan, quat quang
quang doan » quan doan, quang hoan, quang toan
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu so
hieu luat » hieu qua
tinh quan » tinh quang, trinh quan, tin quan
doan kiem » toan kiem, hoan kiem, doan dieu
kiem soat » kiem toan
dung lan » dung luan, dung land, dung lam
lan van » luan van, lang van, tan van

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