Perhaps you should try some spelling variations:
trinh dong » trinh duong, trinh dung, trinh cong
quang ban » quang binh, quang tuan, quang tran
dong luan » dung luan, tong luan, dong xuan
hieu soat » hieu suat, hieu hoat, hieu luat
quan van » quan va, quan luan, quan doan
van hieu » cao hieu
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 ((quang ban) or (quan van)) hieu qua ) or ( trinh dong luan van hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung ((quang ban) OR (quan van)) hieu qua ) OR ( trinh dong luan van hieu soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung ((quang ban) or (quan van)) hieu qua ) or ( trinh dong luan van hieu soat ))*.