Perhaps you should try some spelling variations:
doanh luan » doanh nhan
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
nho hieu » nha hieu, nho sieu, nhu hieu
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho hieu lang - canh ((doanh cua) or (doanh luan)) thong cong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu lang - canh ((doanh cua) OR (doanh luan)) thong cong dan than tap.
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - canh ((doanh cua) or (doanh luan)) thong cong dan than tap*.