Perhaps you should try some spelling variations:
nang quang » nang quan, dang quang, hang quang
hieu soat » hieu suat, hieu hoat, hieu luat
quang doi » quan doi, quang hoi, quang dai
hien soan » bien soan, thien toan, dien toan
van hieu » cao hieu
tin nang » ki nang, thi nang, van nang
doi hien » doi dien, doi bien, doi kien

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) or (tinh quang)) luan van hieu soat ) or ( tin nang quang doi hien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tin dung) OR (tinh quang)) luan van hieu soat ) OR ( tin nang quang doi hien soan )).
• Adding a wildcard symbol may retrieve word variants: (( ((tin dung) or (tinh quang)) luan van hieu soat ) or ( tin nang quang doi hien soan ))*.