Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
canh doanh » hanh doanh, chinh doanh, kinh doanh
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
cua nhung » va nhung
cong van » cong vang, cong san, song van
chat cau » chat cam, chat va, chat ban
chat cao » chat co, chat cho, chat bao
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - ((canh doanh) or (doanh doanh)) cua nhung cong van ((chat cau) OR (chat cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((canh doanh) OR (doanh doanh)) cua nhung cong van ((chat cau) OR (chat cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((canh doanh) or (doanh doanh)) cua nhung cong van ((chat cau) OR (chat cao))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((canh doanh) or (doanh doanh)) cua nhung cong van ((chat cau) OR (chat cao))*.