Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
san bang » can bang, san sang, gan bang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
can ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - canh thanh ((san bang) or (can ban)) cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh thanh ((san bang) OR (can ban)) cong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh thanh ((san bang) or (can ban)) cong dan toan ban*.