(1) 'Buffett' has two 't's
(2) Still, either [site:news.ycombinator.com Warren Buffet] or [site:news.ycombinator.com Warren Buffett] returns 90-180 results for me from Google. Is there a specific recent result you're expecting that it's missing? If so, that's Google's limitation.
(3) There's also searchyc.com to try; it returns 157 results for [Warren Buffet] and 86 results for [Warren Buffett].