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 dang » cua cong, cua ban
kha nang » ky nang, ki nang, thi nang
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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