How to limit search results?

Is there a way to limit search results to just x265 releases or by the group releasing it eg 'kogi' 'phoenix' or 'megusta'?

A checkbox was added so that x265 could be seen or hidden... can the same be done for x264. Can search parameters include
more than just the show title?

I'm sure that I am not the only one who would benefit from these options.