Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu quang » thieu quang, hieu quan, hieu qua
dung cong » dung trong
anh tang » anh dang, anh nang, anh sang
anh bang » anh hoang, anh quang, tinh bang
vat dung » van dung, va dung, viet dung
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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: ho ((chieu xanh) OR (hieu quang)) - ((anh tang) OR (anh bang)) vat dung cong dan van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (hieu quang)) - ((anh tang) OR (anh bang)) vat dung cong dan van ban~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (hieu quang)) - ((anh tang) OR (anh bang)) vat dung cong dan van ban*.