Because search engines index piracy sites despite takedown requests. However, Google demotes them in rankings. Your search string with vegamovies is a long-tail query that slips through sometimes.
Based on the subject line "strangerthingss01720phindiengvegamoviesn," strangerthingss01720phindiengvegamoviesn
It looks like you have a file name or a search string for Stranger Things Season 1 in 720p resolution with Hindi and English audio. Because search engines index piracy sites despite takedown