Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » dung cong, thong cong, nhung don
hieu lang » hieu quang, nhieu tang, hieu van
doanh cua » doanh luan
hang cong » dang cong, hang nong, bang cong
van van » tan van, san van, van vat

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - hanh doanh cua ((nhung cong) OR (hang cong)) van van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (hieu lang)) - hanh doanh cua ((nhung cong) or (hang cong)) van van ban~".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) OR (hieu lang)) - hanh doanh cua ((nhung cong) or (hang cong)) van van ban*.