Perhaps you should try some spelling variations:
nhung cuong » nhung cong, hung cuong, nhung chong
theo chieu » theo tieu, theo chu, thi chieu
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
ho chieu » hoc thieu, doi chieu, mot chieu
bai toan » bai tap
va toan » van toan, tap toan, va thanh

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: ((ho chieu) OR (theo chieu)) xanh - hanh tranh cua nhung cuong ((va toan) OR (bai toan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) xanh - hanh tranh cua nhung cuong ((va toan) OR (bai toan)) ban~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) xanh - hanh tranh cua nhung cuong ((va toan) OR (bai toan)) ban*.