Why can't I search for projects on Kickstarter that haven't yet reached their target?

Over the last couple of weeks I've spent a little more browsing Kickstarter than previously and I noticed something that seems unusual, and a little frustrating. Specifically, if I'm looking to find projects that I'm interested in I can do that pretty easily using the search facility. But if I want to filter that list down to projects I can help out, or projects that haven't ended yet, I can't! This seems like such an oversight that I've been wondering if it's actually an intentional design choice on the part of the Kickstarter devs. I can't quite think of a good reason why that would be though.