Method to filter lectures by video and text pages?

This site is great! Although I'm out of high school, I wanted to brush up on my math and science skills, and this place has been a HUGE help with its videos, articles, and practice material.

However, I've always wondered... when searching through the material, is there any way to filter the results by video, article, or practice problems? Although I enjoy watching videos when I'm really confused, if I'm just reviewing something, I tend to stick to reading articles; for me, it's just a much faster way to find equations/key phrases, etc.

When looking for a specific topic, if there were some way to search/filter results based on their format (video, article, practice problems), I think that it would be a big help for a site like this. Not only would it streamline searching for the end-user, but this feature could also reduce the server load by only displaying desired results.