Perhaps you should try some spelling variations:
trinh nang » tinh nang, trinh bang, trinh mang
dinh luong » dinh duong, dinh huong, dinh cuong
luong luan » luong quan, luong xuan, cuong luan
kiem soat » kiem toan
hieu hoa » tieu hoa, dieu hoa, hiep hoa
van kiem » va kiem, van kien, van hieu
suat va » xuat va
va hieu » van hieu, va dieu, va hien

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 nang suat va hieu hoa ) OR ( dinh luong luan van kiem soat ))~.
• Adding a wildcard symbol may retrieve word variants: (( trinh nang suat va hieu hoa ) or ( dinh luong luan van kiem soat ))*.