Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
nguoi dao » nguoi tay
doc hieu » toc thieu, hoc thieu, hoc hien
cac dung » cach dung, cac duong, tac dung
cac dong » cac duong, cac cong, cac dang
dao than » dao thanh, dan than, dao thai
than cap » khan cap, thanh lap, thanh cac

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 - canh tranh ((cac dung) or (cac dong)) nguoi dao than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh tranh ((cac dung) OR (cac dong)) nguoi dao than cap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh ((cac dung) or (cac dong)) nguoi dao than cap*.