Perhaps you should try some spelling variations:
dang quang » dung quang, nang quan, dang hung
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu hoat, hieu luat, kiem soat
hieu suat » hieu luat, hieu qua
quang hoi » quang huy, quan doi, quang tri
bien soan » bien so
tin dang » tin dung, tin nang, tin mang
hoi bien » hoa bien, hoi vien, voi bien
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 luan van ((hieu soat) OR (hieu suat)) ) or ( tin dang quang hoi bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van ((hieu soat) OR (hieu suat)) ) OR ( tin dang quang hoi bien soan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung luan van ((hieu soat) OR (hieu suat)) ) or ( tin dang quang hoi bien soan ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van ((hieu soat) OR (hieu suat)) ) or ( tin dang quang hoi bien soan ))*.