Perhaps you should try some spelling variations:
trinh dong » trinh duong, trinh dung, trinh cong
hieu soat » hieu suat, hieu hoat, kiem soat
hieu luat » hieu qua
tien soat » trien hoat, thien hoat, kiem soat
dong san » cong san, dong bang, dong von
van tien » toan tien, van hieu, van tuan
san van » tan van, tran van, dang van
luan » quan, lan

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dong san van ((hieu soat) OR (hieu luat)) ) OR ( tin dung luan van tien soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh dong san van ((hieu soat) OR (hieu luat)) ) or ( tin dung luan van tien soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( trinh dong san van ((hieu soat) OR (hieu luat)) ) or ( tin dung luan van tien soat ))*.