Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh tang » hanh trang, anh tang, hanh mang
cong tung » cong dung, cong hung, cong tang
doc hieu » toc thieu, hoc thieu, hoc hien
tang cua » mang cua, hang cua, tang luan
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh

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