Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
van nhung » van nhuong, va nhung, van hung
anh nang » ganh nang, anh bang, anh dang
nang van » dang van, tang van, lang van
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan tap » toan ban

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: theo ((hieu lang) OR (hieu quang)) - anh nang van nhung ((cong tan) OR (cong tac)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) OR (hieu quang)) - anh nang van nhung ((cong tan) or (cong tac)) toan tap~".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) OR (hieu quang)) - anh nang van nhung ((cong tan) or (cong tac)) toan tap*.