1
As mentioned in my comment the way to filter out a long list of sites from Google search is by creating a Google Custom Search Engine (CSS). This allows you to have it customized with up to 500 sites.
How to create a Google Custom Search Engine (CSS) in 6 steps
1. Go to https://cse.google.com/cse/create/new
2. Add any name as your site in the "Sites to ...
Only top voted, non community-wiki answers of a minimum length are eligible
