Perhaps you should try some spelling variations:
dinh luong » dinh huong, dinh cuong, dinh quang
tinh nang » trinh nang, tin nang, tich nang
nang quan » ban quan, nang suat
kien soat » kiem soat, bien soan, kien hoa
quan van » luan van, quan va, quan luan
van hieu » cao hieu
van kien » van tien, van hien, van chien

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 nang quan van hieu qua ) OR ( ((dinh luong) OR (dinh duong)) quan van kien soat ))~.
• Adding a wildcard symbol may retrieve word variants: (( tinh nang quan van hieu qua ) or ( ((dinh luong) or (dinh duong)) quan van kien soat ))*.