Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
quang lan » quang ban, quang lam, quang uan
hieu suat » hieu luat, hieu qua
van kieu » van kien, van kiem, van tieu
kieu van » hieu van, sieu van, lieu van
dinh lua » dinh cua, dinh luc, dinh xuan
van hieu » cao hieu
lan van » lang van, tan van, san van
danh tu » anh tu, doanh thu
luan » quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh quang lan van kieu van ) or ( ((dinh lua) or (danh tu)) luan van hieu suat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh quang lan van kieu van ) OR ( ((dinh lua) OR (danh tu)) luan van hieu suat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh quang lan van kieu van ) or ( ((dinh lua) or (danh tu)) luan van hieu suat ))*.