Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
canh trinh » canh tranh, hanh trinh, canh tinh
dung cong » dung trong
tranh ban » trinh ban, tranh hang, tranh luan
trinh va » trinh van, trinh vat, trinh ve
cong tan » cong tac, cong san, cong thanh
tran ban » tran van, toan ban, tran bai
va dung » van dung, va duong, vat dung

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

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