I didn't find one for Google, but there is a Unity lens available for DuckDuckGo (which also is a search engine, with the advantage that it doesn't track you).

To install it type the following commands into your terminal:

sudo add-apt-repository ppa:w-vollprecht/ppa 

sudo apt-get update

sudo apt-get install duckduckgo-len

For other good lenses you can also have a look here: What lenses for Unity are available?