Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
hang cong » dang cong, hang nong, bang cong
anh dang » anh dong, anh dung, anh bang
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
dang va » dang van, dang vat, hang va
va hang » van hang, va nang, va lang

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 ((hieu lang) OR (((chieu sang) OR (chieu xanh)))) - anh dang va hang cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (((chieu sang) OR (chieu xanh)))) - anh dang va hang cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (((chieu sang) OR (chieu xanh)))) - anh dang va hang cong tac toan cau*.