Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
canh van » anh van, can van, canh dan
cach van » cac van, bach van, cach mang
cua dang » cua cong, cua ban
cong van » cong vang, cong san, song van
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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 van) OR (cach van)) cua dang cong van ((than cau) OR (phan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - ((canh van) OR (cach van)) cua dang cong van ((than cau) or (phan cau))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((canh van) OR (cach van)) cua dang cong van ((than cau) or (phan cau))*.