Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
tinh dung » trinh dung, tin dung, tinh huong
hieu soat » hieu suat, hieu hoat, hieu luat
nang quan » ban quan, nang suat
doi thien » doi hien, doan thien, duoc thien
quan van » luan van, quan va, quan luan
van hieu » cao hieu
tin nang » tin dung, ki nang, thi nang
quan doi » quan tri, quan li

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) OR (tinh quang)) quan van hieu soat ) OR ( tin nang quan doi thien thanh ))~.
• Adding a wildcard symbol may retrieve word variants: (( ((tinh dung) or (tinh quang)) quan van hieu soat ) or ( tin nang quan doi thien thanh ))*.