Google Drive – How to Remove ‘Quick Access’

You're going to want to open the Settings menu, then Manage Apps:

Then, disconnect the app

Google Drive does not offer the option to search for other users' public documents (see here).

However, it is possible for users to find these documents via Google Search using a filter. In order to search exclusively for public Google documents, a user would have to search using the following:

site:docs.google.com/document/d [keyword]

To create a tool that would allow users to search for these documents, you might consider simply creating an HTML form that submits to google with the site:docs.google.com/document/d prepended.

Here's a quick demo of that using AngularJS:

https://github.com/cweems/Google-Docs-Search/tree/cc00038e67d6d3ff15ae19a271f0bfec99437b41

Navigate to the 'app' folder and then open index.html in your browser. Enter keywords into the text box and click submit: it will return a list of results that are only Google Docs.