Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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 tranh) or (hanh trinh)) cua dung cong ((dan toan) or (dan than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((canh tranh) OR (hanh trinh)) cua dung cong ((dan toan) OR (dan than)) tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((canh tranh) or (hanh trinh)) cua dung cong ((dan toan) or (dan than)) tap*.