Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
hanh tang » hanh trang, anh tang, hanh mang
cua dang » cua cong, cua ban
kha nang » phap nang, ky nang, ki 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) OR (nhieu tang)) - hanh tang ((cua dang) or (kha nang)) cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (nhieu tang)) - hanh tang ((cua dang) OR (kha nang)) cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) OR (nhieu tang)) - hanh tang ((cua dang) or (kha nang)) cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) OR (nhieu tang)) - hanh tang ((cua dang) or (kha nang)) cong san toan cau*.