Perhaps you should try some spelling variations:
quang luan » quan luan, quang tuan, quang uan
dinh luong » dinh duong, dinh huong, dinh cuong
luong quan » thong quan, duong qua
hieu soat » hieu suat, hieu hoat, hieu luat
lien soat » kiem soat, bien soan, lien son
van hieu » cao hieu
quan doi » quan tri, quan li
bien so » bien doi
tinh » trinh, minh, kinh

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 quang luan van hieu soat ) OR ( dinh luong quan doi ((lien soat) OR (bien so)) ))~.
• Adding a wildcard symbol may retrieve word variants: (( tinh quang luan van hieu soat ) or ( dinh luong quan doi ((lien soat) or (bien so)) ))*.