Perhaps you should try some spelling variations:
canh manh » lanh manh, canh tranh, cach mang
hien anh » hien hanh, thien anh, dien anh
manh cua » doanh cua, ban cua
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien anh - canh manh cua cong ((cong tan) OR (cong san)) ((toan tai) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien anh - canh manh cua cong ((cong tan) OR (cong san)) ((toan tai) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien anh - canh manh cua cong ((cong tan) OR (cong san)) ((toan tai) or (toan cao))*.