Perhaps you should try some spelling variations:
cong quang » luong quang, thong quang, duong quang
trinh cong » trinh dung
quang tran » quang tuan, quang trung, quang thanh
tran thien » tran hien, tran chien, tran tien
hieu soat » hieu suat, hieu hoat, hieu luat
luan va » luan van, luat va
va hieu » van hieu, va dieu, va hien
tin » tinh

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 luan va hieu soat ) or ( trinh cong quang tran thien thuat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan va hieu soat ) OR ( trinh cong quang tran thien thuat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan va hieu soat ) or ( trinh cong quang tran thien thuat ))*.