To do an advanced search:
Click on the search button while there is no text in the search box. make sure the search box is empty. It will take you to the search page.
Click on advanced search and now you have a whole bunch of options.
For example if you're searching for Gary Burton video, you'd enter Gary Burton in the search as a phrase box and then click on video on the right. This will narrow things down a lot. You'll still probably have to sift through stuff, but not nearly as much as if you search the whole site.
Also when you search for something you'll see the results and right at the top you'll see 'advanced search' menu and can open this up from there as well.