Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
va duong » van duong, va tuong, va huong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
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: doc hieu xanh - hanh tranh ((va dung) or (va duong)) cong ((dan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh tranh ((va dung) OR (va duong)) cong ((dan toan) OR (dan than)) cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh tranh ((va dung) or (va duong)) cong ((dan toan) or (dan than)) cau*.