Donor personal information exposed in Google searches
1. Find and Fix the problem: 

1a) Check your Permissions settings in admin/people/permissions
Look in the Anonymous User role column -> for permissions such as : View Any Contact in the CiviCRM database; There are a lot of settings - examine them all - and remove any checkboxes for Anonymous that are not appropriate; 

1b) It's also quite possible that you've misconfigured Profile/Fields to be listed publicly; here's the documentation for that: https://docs.civicrm.org/user/en/latest/organising-your-data/profiles/#making-directories-with-profiles - note that for every Field in a profile - you can specify it's Visibility; examine if any of the fields are set to Public (and if so - correct them to User and Admin);

2. Address the Google Indexing: get into your Google Webmaster Tools account (create one if you don't have one yet) - and remove the unwanted links from the Search Index.