I removed a chat from gmail chat history. After 30 days it was deleted from the trash, too.
But now it is very important to look for some information there. Can I somehow restore it? :(

Sorry, but you can't.
Once it's gone it's gone for good.

You could try one of the many undelete/restore programs, but to be honest your wasting your time.

Ok(
Anyway thanks 4 answer