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