Perhaps you should try some spelling variations:
minh thong » minh thuong, minh tuong, minh thang
tinh dung » trinh dung, tin dung, tinh quang
hieu suat » hieu luat, hieu qua
bien soan » bien so
van hieu » cao hieu
quan van » quan va, quan luan, quan doan
van bien » van tien, van hien, vat bien
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: (( tinh dung luan van hieu suat ) or ( minh thong quan van bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu suat ) OR ( minh thong quan van bien soan )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu suat ) or ( minh thong quan van bien soan ))*.