Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu qua, diep quang
luong cong » dung cong, trong cong, cong cong
hieu quan » hieu qua, lieu quan, thien quan
duc luong » duc cuong, duc long, du luong
anh nang » ganh nang, anh bang, anh dang
nang duc » nang luc, nang doc, nang du
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan dau » phan dau, han dau, chan doan

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: nha ((hieu quang) OR (hieu quan)) - anh nang duc luong cong dan chan dau~.
• Adding a wildcard symbol may retrieve word variants: nha ((hieu quang) or (hieu quan)) - anh nang duc luong cong dan chan dau*.