Perhaps you should try some spelling variations:
thien hoat » trien hoat, thien thuat, tien hoa
minh thong » minh thuong, minh tuong, minh thang
tinh dung » trinh dung, tin dung, tinh quang
hieu hoat » hieu hoa, hieu luat, hieu suat
bien soan » bien so
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 hoat) OR (thien hoat)) ) 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 hoat) OR (thien hoat)) ) OR ( minh thong quan van bien soan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung luan van ((hieu hoat) OR (thien hoat)) ) or ( minh thong quan van bien soan ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van ((hieu hoat) OR (thien hoat)) ) or ( minh thong quan van bien soan ))*.