Perhaps you should try some spelling variations:
hieu soat » hieu suat, hieu hoat, hieu luat
tien soan » bien soan, tien hoang, thien toan
van hieu » cao hieu
dung lam » dung tai, dung dat, dung ha
san tien » van tien, san ten, sang tieng
lam san » lam sang, lam son, luan san
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 soat ) or ( trinh dung lam san tien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung luan van hieu soat ) OR ( trinh dung lam san tien soan )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung luan van hieu soat ) or ( trinh dung lam san tien soan ))*.