Search button doesn't work in intranet

Hi, I have a school intranet wich was working fine until my server provider migrated it to a new server a couple of weeks ago. Since then there is a button of the intranet wich doesn't work anymore. It's a button that allow the students to list their own notes by first, second, or third course, but now when you clic on it you don't get the list of notes but a blank result. Thanks.