Perhaps you should try some spelling variations:
dung quang » dang quang, dung quan, luong quang
quang luat » quan luan, quang cua, quang tuan
hieu soat » hieu suat, hieu hoat, hieu luat
luat kiem » luat viet, luat kinh, luat ke
kiem soat » kiem toan
van hieu » cao hieu
luan » quan, lan

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

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