Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
van thanh » ban thanh, van tuan
thanh cau » thanh chau, thanh mau, nhanh cau
doc hieu » toc thieu, hoc thieu, hoc hien
canh ban » can ban, canh dan, canh van
cua dang » cua ban
cong van » cong vang, cong san, song van

You may be able to get more results by adjusting your search query.

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