Perhaps you should try some spelling variations:
tinh thong » tinh thuong, trinh thong, tinh khong
hieu soat » hieu suat, hieu hoat, hieu luat
kien soat » kiem soat, bien soan, kien hoa
van hieu » cao hieu
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.

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh dung luan van hieu soat ) or ( tinh thong quan va kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung luan van hieu soat ) OR ( tinh thong quan va kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung luan van hieu soat ) or ( tinh thong quan va kien soat ))*.