Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
doanh luan » doanh nhan
hieu lang » chieu sang, hieu quang, nhieu tang
luan tong » luan tuong, luan cong, luan dong
cong cong » cong dong, trong cong, dung cong
cong vang » cong lang, cong quang, cong ngang
thanh cha » thanh ha, thanh nha, thanh phan
doi hieu » doi chieu, doc hieu, doi hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - hanh doanh luan tong ((cong cong) or (cong vang)) thanh cha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh doanh luan tong ((cong cong) OR (cong vang)) thanh cha*.