Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
doanh cua » doanh luan
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
hoc hieu » hoc thieu, hoc hien, doc hieu
bai toan » bai tap
toan cao » toan ban, toan tap

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 manh - hanh doanh cua ((hang cong) or (bang cong)) bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh doanh cua ((hang cong) OR (bang cong)) bai toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh doanh cua ((hang cong) or (bang cong)) bai toan cao*.