Perhaps you should try some spelling variations:
dang nguong » dung nguon, dang thuong, tang nguon
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh manh » hanh mang, lanh manh, hoang manh
manh cua » doanh cua, ban cua
cua dang » cua cong, cua ban
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - hanh manh cua dang nguong ((dan than) or (ban than)) man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh manh cua dang nguong ((dan than) OR (ban than)) man.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh manh cua dang nguong ((dan than) or (ban than)) man*.