About Google Searching URL Get Parameters
When you search using Google, the query string changes into a whole long list of URL parameters that can be incredibly useful to reverse engineer if you’re doing stuff pragmatically. Google has some reference documentation as to what these parameters are, but the community appears to have done a good job as well of reverse engineering these parameters.
Here is an article from 2008 from a very reliable source with a lot of comments speculating some of the well known, and other less known and / or undocumented query parameters:
https://moz.com/blog/the-ultimate-guide-to-the-google-search-parameters