Boolean algebra. Need help please

I need help with a project at university, I would really appreciate if anybody could help me, it is about simplifying maxterms and minterms.

I simplified the minterms and the final expression is (A'B'D'+A'BC+AC')

I have been trying to simplify the maxterms but I cannot get the same final expression as with the minterms because they are supposed to be the same.

My maxterms are -

{(A+B+C+D') (A+B+C'+D') (A+B'+C+D) (A+B'+C+D') (A'+B+C'+D)(A'+B+C'+D') (A'+B'+C'+D) (A'+B'+C'+D').

I need the algebric way solution step by step. Please help me if you can I have to finish this as fast as I can. Sorry for my bad english