Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh tang » hanh trang, hanh mang, hanh tung
cong cong » cong dong, trong cong, dung cong
cong dang » cong dong, cong dan, cong dung
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
dang van » hoang van, hang va
van cac » van hac, van cau, van bac

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 - ((hanh tang) or (anh tang)) cua cong cong dang van cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((hanh tang) OR (anh tang)) cua cong cong dang van cac*.