Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung cua » truong cua, trung tuan, trung cap
doc hieu » toc thieu, hoc thieu, hoc hien
tung cua » tuong cua, dung cua, tang cua
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
than ban » thanh ban, toan ban, than man

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 - thanh ((tung cua) OR (trung cua)) dung ((cong tan) OR (cong tac)) than ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - thanh ((tung cua) OR (trung cua)) dung ((cong tan) or (cong tac)) than ban~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh ((tung cua) OR (trung cua)) dung ((cong tan) or (cong tac)) than ban*.