Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
lanh manh » lanh tranh, lan anh, van manh
dong cong » duong cong, dung cong, dang cong
doc hieu » toc thieu, hoc thieu, hoc hien
manh cua » doanh cua, ban cua
cua dong » chua dong, cua cong, cua dang
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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 - lanh manh cua dong cong ((dan than) or (van than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - lanh manh cua dong cong ((dan than) OR (van than)) ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - lanh manh cua dong cong ((dan than) or (van than)) ban*.