Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
dung cong » dung trong
hoi hieu » hoi phieu, hoi tieu, moi hieu
tranh va » tranh van, trang va, trinh va
tuan cau » toan cau, quan cau, thuan cam
tuan cu » tuan tu, quan cua, tuan thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - canh tranh va ((hang cong) or (dung cong)) van ((tuan cau) or (tuan cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - canh tranh va ((hang cong) OR (dung cong)) van ((tuan cau) OR (tuan cu)).
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - canh tranh va ((hang cong) or (dung cong)) van ((tuan cau) or (tuan cu))*.