Problems using GET variables

Hi,

I would like to be able to use the post URL to pass variables to my post.

For example:
https://www.example.com/my-new-post?p1=google&p2=yahoo

My permanlinks are set to:
/%postname%/

Any idea how I can do this? I have made a few attempts, but they always end up with a 404 error ??

Thanks, Mads