Perhaps you should try some spelling variations:
minh thong » minh thuong, minh tuong, minh thang
thong chan » thong chuan, thong phan, thong nhan
doan thien » hoan thien, doan thi, toan thiet
thien soat » thien hoat, trien hoat, thien phat
hieu suat » hieu luat, hieu qua
van hieu » cao hieu
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh dung luan van hieu suat ) or ( minh thong chan doan thien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung luan van hieu suat ) OR ( minh thong chan doan thien soat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung luan van hieu suat ) or ( minh thong chan doan thien soat ))*.