Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
canh hang » tranh hang, cang thang, danh thang
va phuong » va thuong, cac phuong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
phan dau » phan tu, hang dau

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 hang va phuong ((cong dan) or (cong san)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh hang va phuong ((cong dan) OR (cong san)) phan dau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh hang va phuong ((cong dan) or (cong san)) phan dau*.