Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh tranh » canh tranh, hanh trinh, hanh trang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh 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: doi ((chieu sang) OR (chieu sach)) - hanh tranh ((cua nhung) OR (va nhung)) cong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (chieu sach)) - hanh tranh ((cua nhung) or (va nhung)) cong dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) OR (chieu sach)) - hanh tranh ((cua nhung) or (va nhung)) cong dan toan cau*.