Perhaps you should try some spelling variations:
dung quan » dung quang, dung luan, luong quan
hieu soat » hieu suat, hieu hoat, hieu luat
tinh dung » trinh dung, tinh quang, tinh huong
luan kiem » luat kiem, khuan kiem, luong kiem
kiem soat » kiem toan
quan van » luan van, quan va, quan doan
van hieu » cao hieu

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

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