Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
cong tan » cong tac, cong san, cong thanh
tran ban » tranh ban, tran van, toan ban
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) OR (hieu lang)))) - canh trinh va dung cong tan tran ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (((nhieu tang) OR (hieu lang)))) - canh trinh va dung cong tan tran ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chinh sach) or (((nhieu tang) OR (hieu lang)))) - canh trinh va dung cong tan tran ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (((nhieu tang) OR (hieu lang)))) - canh trinh va dung cong tan tran ban*.