Ask HN: How to search for newly indexed websites for a particular keyword?

Is there any tools I can use to find new websites for certain keywords, prioritised by how recently they have been indexed?

For example I want to be alerted everytime a new website is indexed by Google for the keyword "Badminton".

Effectively I am looking for wholly new websites (not just a new blog post on an existing website) and am hoping this method will help me identify it.