Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » hanh trinh, hanh trang, lanh tranh
doi chieu » doc hieu, doi chi, ho chieu
va duong » van duong, va tuong, va huong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tap » toan ban
va dung » van dung, vat dung, va ung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - ((hanh tranh) or (canh tranh)) ((va dung) OR (va duong)) cong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((hanh tranh) OR (canh tranh)) ((va dung) OR (va duong)) cong dan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((hanh tranh) or (canh tranh)) ((va dung) OR (va duong)) cong dan toan tap".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((hanh tranh) or (canh tranh)) ((va dung) OR (va duong)) cong dan toan tap*.