Perhaps you should try some spelling variations:
dang quang » dung quang, nang quan, dang hung
tinh luong » tinh huong, dinh luong, minh luong
luong quan » thong quan, duong qua
luan kiem » luat kiem, khuan kiem, luong kiem
kiem soat » kiem toan
hieu soat » hieu suat, hieu hoat, hieu luat
quan van » luan van, quan va, quan luan
van hieu » cao hieu

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 ((dang quang) OR (dung luan)) luan kiem soat ) OR ( tinh luong quan van hieu soat ))~.
• Adding a wildcard symbol may retrieve word variants: (( tinh ((dang quang) or (dung luan)) luan kiem soat ) or ( tinh luong quan van hieu soat ))*.