Video files can be particularly more difficult if they are from other gnutella programs. eg: Shareaza (raza). To know which client program is offering the file, control-click the very top of the search results columns & a contextual menu will appear allowing you to choose to show Vendor as an extra column. You can also do this with the downld window & the upload window.

I guess the best thing to do is look for other options. If you vary your search you may find better & more reliable sources. See if this helps; Can’t search well help (click on link)