Perhaps you should try some spelling variations:
quang tran » quang tuan, quang trung, quang thanh
quang ban » quang binh, quang tuan, qua ban
hieu soat » hieu suat, hieu hoat, hieu luat
dinh duan » dinh xuan, dinh duong, dinh quang
duan luan » quan luan, dan luan, doanh luan
hien soat » thien hoat, kiem soat, bien soan
van hieu » cao hieu
van hien » van tien

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( kinh ((quang ban) OR (quang tran)) van hieu soat ) or ( dinh duan luan van hien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( kinh ((quang ban) OR (quang tran)) van hieu soat ) OR ( dinh duan luan van hien soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( kinh ((quang ban) OR (quang tran)) van hieu soat ) or ( dinh duan luan van hien soat ))".
• Adding a wildcard symbol may retrieve word variants: (( kinh ((quang ban) OR (quang tran)) van hieu soat ) or ( dinh duan luan van hien soat ))*.