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

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 dung va nhung 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 dung va nhung cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((((hieu lang) OR (chieu sang))) or (chieu xanh)) - anh dung va nhung cong tac toan cau*.