Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
cong vang » cong lang, cong quang, cong ngang
van dung » van dong, xay dung, tin dung
cong tac » cong ty
va dung » va duong, vat dung, va ung
tan tap » toan tap, han tap, tan tat

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: doi chieu xanh - canh tranh ((va dung) OR (van dung)) ((cong vang) OR (cong tac)) tan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu xanh - canh tranh ((va dung) OR (van dung)) ((cong vang) or (cong tac)) tan tap~".
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - canh tranh ((va dung) OR (van dung)) ((cong vang) or (cong tac)) tan tap*.