Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
manh toan » thanh toan, anh tuan, tinh toan
toan tran » thoan tran, tan tran, hoan tran
hieu soat » hieu suat, hieu hoat, hieu luat
thanh van » thanh san, thanh toan, thanh phan
tran van » luan van
van hieu » cao hieu
van bien » van tien, van hien, vat bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( manh toan tran van hieu soat ) or ( tinh quang thanh van bien doi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( manh toan tran van hieu soat ) OR ( tinh quang thanh van bien doi ))*.