URL: https://ahmia.fi/
There are search engine(s) specialized for TOR. As per Wikipedia[1]: 'Ahmia is a clearnet search engine for Tor's hidden services'. It was part of Google summer of code in 2014[2].
[1] https://en.wikipedia.org/wiki/Ahmia [2] https://blog.torproject.org/category/tags/gsoc-2014