Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
luan phong » luan phuong, xuan phuong, luan phan
hieu lang » chieu sang, hieu quang, nhieu tang
van phong » van dong, hai phong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan tap, toan tai
toan ban » van 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 lang - hanh doanh ((luan phong) or (van phong)) cong dan ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh doanh ((luan phong) OR (van phong)) cong dan ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh doanh ((luan phong) or (van phong)) cong dan ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh doanh ((luan phong) or (van phong)) cong dan ((toan cau) OR (toan ban))*.