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Looking to learn something new?
You could always implement https://www.google.com/cse/ (Google custom search engine). I've seen many sites use this, for example http://www.ross-tech.com uses this implementation. If you want something cleaner looking it will be more involved to code, or you could buy a cheap php search script off of code canyon.
Alec Wilson820 Points
Hi Curtis, If you still haven't solved your site search problems (or want to improve your search), check out Swiftype - it's a dead simple, yet fast and robust site search provider that you can try for free. Companies like TechCrunch and Twitch use it already. Check it out at Swiftype.com