Perhaps you should try some spelling variations:
trien hoat » tien hoa
quan thanh » ban thanh, van thanh
hieu soat » hieu suat, hieu hoat, hieu luat
dinh quan » dinh quang, dinh xuan, dinh duan
thanh van » thanh san, thanh toan, thanh phan
van trien » van tien, va trien, van tren
tin quan » tinh quang, trinh quan, lien quan
van hieu » cao hieu
luan » lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin quan luan van hieu soat ) or ( dinh quan thanh van trien hoat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin quan luan van hieu soat ) OR ( dinh quan thanh van trien hoat )).
• Adding a wildcard symbol may retrieve word variants: (( tin quan luan van hieu soat ) or ( dinh quan thanh van trien hoat ))*.