Perhaps you should try some spelling variations:
thong cong » tong cong, thong thong, phong chong
hanh doanh » hang doanh, chinh doanh, doanh doanh
hieu lang » chieu sang, hieu quang, nhieu tang
doanh cua » doanh luan
tan thanh » tran thanh, tang thanh, toan thanh
thanh cha » thanh ha, thanh nha, thanh phan
hoc hieu » hoc thieu, hoc hien, doc hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh doanh cua ((thong cong) or (trong cong)) tan thanh cha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh doanh cua ((thong cong) OR (trong cong)) tan thanh cha.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh doanh cua ((thong cong) or (trong cong)) tan thanh cha*.