Perhaps you should try some spelling variations:
dang cong » dung cong
chi lang » chi van, hoi lang, chi dan
tranh va » tranh van, trang va, trinh va
cong san » cong tac
toan cao » toan ban
toan tap » toan ban
thi lan » thi hanh, thi nang, thi lien
va dang » van dang, 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: doi ((chi lang) OR (thi lan)) - canh tranh va dang cong san ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi lang) OR (thi lan)) - canh tranh va dang cong san ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi lang) OR (thi lan)) - canh tranh va dang cong san ((toan cao) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doi ((chi lang) OR (thi lan)) - canh tranh va dang cong san ((toan cao) or (toan tap))*.