I've been using Neeva, it works well.
Their slogan:
>try Neeva, 100% ad-free search engine, Totally private
Their founders:
>Neeva was founded by Sridhar Ramaswamy (ex-SVP of Ads at Google) and Vivek Raghunathan (ex-VP of Monetization at YouTube). They met in the early days of search ads at Google, and came up with the idea for Neeva over hikes and coffee.
They have founded a company that explicitly doesn't need the knowledge that they had acquired in their job.