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, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
san phan » san pham, van phan, sat phan
phan cau » phan dau, phan cac, phan tu
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)) luan ((nhung cong) OR (hang cong)) san phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((canh doanh) OR (doanh doanh)) luan ((nhung cong) OR (hang cong)) san phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((canh doanh) or (doanh doanh)) luan ((nhung cong) OR (hang cong)) san phan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((canh doanh) or (doanh doanh)) luan ((nhung cong) OR (hang cong)) san phan cau*.