Perhaps you should try some spelling variations:
trinh thong » trinh thuong, trinh trong, trinh tong
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, kiem soat
hieu luat » hieu qua
kien soat » kiem soat, bien soan, kien hoa
quan va » quan vi, quan ha, luan va
va kien » van kien, va lien, va dien
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 ((hieu soat) OR (hieu luat)) ) OR ( trinh thong quan va kien soat ))~.
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van ((hieu soat) or (hieu luat)) ) or ( trinh thong quan va kien soat ))*.