Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
canh manh » lanh manh, canh tranh, cach mang
thanh cau » thanh chau, thanh mau, nhanh cau
doc hieu » toc thieu, hoc thieu, hoc hien
manh cua » doanh cua, ban cua
cong van » cong vang, song van, cong tan
cong san » cong tac

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 manh cua cong ((cong van) or (cong san)) thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh manh cua cong ((cong van) OR (cong san)) thanh cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh manh cua cong ((cong van) or (cong san)) thanh cau*.