search url change from "term1 term2" to "term1&term2=

Hello!

Has anybody a hint, how to make wordpress uses a “&” instead of a “+” in searching?

I have post submitted authors who should be searchable – I’m using “search everything” but if I’m searching for “Peter Segas” nothing can be found – while I search for “Peter” or “Segas” I get posts listed…

When I change the normal search term from “/?s=Peter+Segas” to “/?s=Peter&Segas” it shows the posts again!

So how can I set up, to use “&” instead of “+”?

Any hint would be great!

Thank you!

AD