Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
nhieu tang » hieu lang, nhiet nang
tranh va » tranh van, trang va, trinh va
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (nhieu tang)) - canh tranh va hang ((cong tan) OR (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (nhieu tang)) - canh tranh va hang ((cong tan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (nhieu tang)) - canh tranh va hang ((cong tan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (nhieu tang)) - canh tranh va hang ((cong tan) OR (cong san)) toan cau*.