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
hieu soat » hieu suat, hieu hoat, hieu luat
dieu hoa » dien hoa, tieu hoa, hieu hoa
van hieu » cao hieu
suat va » xuat va

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