Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh mang
doi hieu » doi chieu, doc hieu, doi hien
cua nang » chua nang, cua dang, cua hang
kha nang » phap nang, ky nang, ki nang
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - hanh tang ((cua nang) or (kha nang)) cong ((dan toan) OR (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh tang ((cua nang) OR (kha nang)) cong ((dan toan) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - hanh tang ((cua nang) or (kha nang)) cong ((dan toan) OR (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh tang ((cua nang) or (kha nang)) cong ((dan toan) OR (dan than)) cau*.