Do you have the option to download these file types after your search or all that comes up are mpg & mpeg?? You can check the Filter Results under type.
When searching for video files, always chech the file with Bitzi before download. If a file has heaps of sources but no Bitzi rating, chances are it's a fake.
Check out the threads below for more info & tips, including how to use Bitzi
Fake files showing up in search results How to find music (tips for video also)
Probably safer to download AVI Files. I won't recommend .mov or .wma