Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
hanh doanh » hang doanh, chinh doanh, kinh doanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
tham dung » pham dung, tham cung, tham nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
gian cau » gian chau, gian cac, gian cam

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 (doanh doanh)) tham dung ((cong dan) OR (cong san)) gian cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hanh doanh) OR (doanh doanh)) tham dung ((cong dan) OR (cong san)) gian cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((hanh doanh) or (doanh doanh)) tham dung ((cong dan) OR (cong san)) gian cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh doanh) or (doanh doanh)) tham dung ((cong dan) OR (cong san)) gian cau*.