Perhaps you should try some spelling variations:
lang hoang » dang hoang, quang hoang, van hoang
thanh tien » thanh nien, thang tien, thanh hien
thanh vien » nhan vien, thanh van
hieu soat » hieu suat, hieu hoat, hieu luat
dinh lang » dinh long, dinh rang, dinh quang
van hieu » cao hieu
tin » tinh
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: (( tin dung luan van hieu soat ) or ( dinh lang hoang ((thanh tien) OR (thanh vien)) soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van hieu soat ) OR ( dinh lang hoang ((thanh tien) OR (thanh vien)) soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung luan van hieu soat ) or ( dinh lang hoang ((thanh tien) OR (thanh vien)) soat ))".
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van hieu soat ) or ( dinh lang hoang ((thanh tien) OR (thanh vien)) soat ))*.