Perhaps you should try some spelling variations:
canh manh » lanh manh, canh tranh, cach mang
hoc hieu » hoc thieu, hoc hien, hoc dieu
doc hieu » toc thieu, hoc thieu, hoc hien
manh cua » doanh cua, ban cua
cua tong » cua cong, cua dong, cua nong
cong dan » cong san, cong tan, cong dong
phan cau » phan dau, phan cac, phan tu

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 hieu) OR (doc hieu)) manh - canh manh cua tong ((cong dan) OR (huong dan)) phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) OR (doc hieu)) manh - canh manh cua tong ((cong dan) or (huong dan)) phan cau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) OR (doc hieu)) manh - canh manh cua tong ((cong dan) or (huong dan)) phan cau*.