Perhaps you should try some spelling variations:
dung quang » dang quang, dung quan, luong quang
dung luat » dung luan, dung quat, dung cua
hieu suat » hieu luat, hieu qua
hieu hoat » hieu hoa, thien hoat, hieu luat
lien toan » dien toan, lien doanh, thien toan
luat bao » luat giao, thuat bao, luat dat
quang va » quang van, quan va, quang ma
va lien » vat lieu, hai lien

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 luat bao ((hieu suat) or (hieu hoat)) ) or ( tin dung quang va lien toan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung luat bao ((hieu suat) OR (hieu hoat)) ) OR ( tin dung quang va lien toan )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung luat bao ((hieu suat) or (hieu hoat)) ) or ( tin dung quang va lien toan ))*.