Perhaps you should try some spelling variations:
dung doanh » dung dan, dung dong
hanh doanh » hang doanh, chinh doanh, doanh doanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trong dan » trong dang, trong san, trong tan
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dung » cua dang, cua dong, qua dung
chan cau » phan cau, chinh cau, nhanh cau
can cau » van cau, ban cau, ca cau

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) or (dung doanh)) cua dung trong dan ((chan cau) or (can cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hanh doanh) OR (dung doanh)) cua dung trong dan ((chan cau) OR (can cau)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh doanh) or (dung doanh)) cua dung trong dan ((chan cau) or (can cau))*.