Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
cong doan » cong dan, cong hoan, dong doanh
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
anh dung » anh dong, anh huong, sach dung
van dung » van dong, xay dung, tin dung
va dong » van dong, ha dong, xa dong
va bao » va bai

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 - ((anh tang) or (anh dung)) ((va dong) or (van dung)) cong doan va bao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((anh tang) OR (anh dung)) ((va dong) OR (van dung)) cong doan va bao.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((anh tang) or (anh dung)) ((va dong) or (van dung)) cong doan va bao*.