Perhaps you should try some spelling variations:
hieu soat » hieu suat, hieu hoat, hieu luat
dung land » dung luan, dung lam, dung san
dung quan » dung quang, dung luan, luong quan
bien soan » bien so
dung lan » dung luan, dung lam, dung san
van hieu » cao hieu
quan van » luan van, quan va, quan luan
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: (( trinh ((dung lan) OR (dung land)) van hieu soat ) or ( tin dung quan van bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh ((dung lan) OR (dung land)) van hieu soat ) OR ( tin dung quan van bien soan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh ((dung lan) OR (dung land)) van hieu soat ) or ( tin dung quan van bien soan ))".
• Adding a wildcard symbol may retrieve word variants: (( trinh ((dung lan) OR (dung land)) van hieu soat ) or ( tin dung quan van bien soan ))*.