Perhaps you should try some spelling variations:
dung quang » dang quang, dung quan, luong quang
tinh dung » trinh dung, tinh quang, tinh huong
quang cao » nang cao, quang nam
hieu soat » hieu suat, hieu hoat, hieu luat
hien soan » thien toan, dien toan, lien son
bien soan » bien so
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: (( tinh dung quang cao hieu soat ) or ( tin dung luan van ((hien soan) OR (bien soan)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung quang cao hieu soat ) OR ( tin dung luan van ((hien soan) OR (bien soan)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung quang cao hieu soat ) or ( tin dung luan van ((hien soan) OR (bien soan)) ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung quang cao hieu soat ) or ( tin dung luan van ((hien soan) OR (bien soan)) ))*.