Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
mang cua » manh cua, dung cua, ban cua
cong van » cong vang, song van, cong tan
cong san » cong tac
toan 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 - cach mang cua nhung ((cong van) or (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - cach mang cua nhung ((cong van) OR (cong san)) toan ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - cach mang cua nhung ((cong van) or (cong san)) toan ban*.