Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, hieu cach
chieu xanh » chieu sang, chieu tinh, hieu manh
bang cong » dang cong, bang song, hang cong
tranh da » tranh dau, trinh da, tranh ha
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap
da bang » dau bang, da nang, da dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((((chieu sach) OR (chieu xanh))) or (chiet tach)) - canh tranh da bang cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((((chieu sach) OR (chieu xanh))) OR (chiet tach)) - canh tranh da bang cong dan toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((((chieu sach) OR (chieu xanh))) or (chiet tach)) - canh tranh da bang cong dan toan cau*".