Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
kien soat » kiem soat, bien soan, kien hoa
tinh quan » tinh quang, trinh quan, tin quan
hieu soat » hieu suat, hieu hoat, kiem soat
hieu luat » hieu qua
van kien » van tien, van hien, van chien
quan san » luan san, quan sat, quan van
san van » tan van, tran van, dang van
luan » 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: (( tinh dung luan van kien soat ) OR ( tinh quan san van ((hieu soat) OR (hieu luat)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung luan van kien soat ) or ( tinh quan san van ((hieu soat) OR (hieu luat)) ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van kien soat ) or ( tinh quan san van ((hieu soat) OR (hieu luat)) ))*.