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
tong dan » tuong dan, thong dan, trong dan
phan cau » phan cac, phan lap, toan cau
phan dau » hang dau
cua han » cua hang, cua nhan, cua phan

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 han tong dan ((((phan cau) OR (phan tu))) OR (phan dau))~.
• Adding a wildcard symbol may retrieve word variants: hoc hien anh - canh manh cua han tong dan ((((phan cau) or (phan tu))) or (phan dau))*.