Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
nang hang » nang sang, hang hang, cang thang
dung cong » dung trong
cong bai » cuong bai, cong hai, cung bai
toan cau » toan cao, toan ban, toan tai
toan tap » 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 (hieu lang)) - nang hang va dung cong bai ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (hieu lang)) - nang hang va dung cong bai ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (hieu lang)) - nang hang va dung cong bai ((toan cau) or (toan tap))*.