I got laid off on Friday so I'm using it as an opportunity to dogfood briansjobsearch.com again. I'm working on a Chrome extension that will help with autofilling job applications. It has dramatically sped up the time it takes to apply to each job even on complicated ATS's.
The site doesn't scrape the web or store anything in the database. So, there's no way for it to know the number of results.
To maximize your results, choose All from the time drop down. You may need to experiment with the job title field to find exactly what you're looking for.