Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
cong thanh » dong thanh, cong trinh, cong tan
bien tinh » bi tinh, yen tinh, diep tinh
doanh cua » doanh luan
cua nhung » va nhung
toan cau » toan cao, toan ban, toan tap
so bien » mot bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: so bien tinh - hanh doanh cua nhung ((cong thanh) or (huong dan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so bien tinh - hanh doanh cua nhung ((cong thanh) OR (huong dan)) toan cau*.