How to do search within search? E.g. I look in my src/ for json, but I get 50 results. In Sublime the result is a file so I can cmd+F it. Not sure how to do it

How to do search within search? E.g. I look in my src/ for json, but I get 50 results. In Sublime the result is a file so I can cmd+F it. Not sure how to do it here though.