Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
luan hang » luan nang, luan hung, luan tang
hoc hieu » hoc thieu, hoc hien, doc hieu
luan han » luan hoan, luan phan, luan van
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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