What Exactly Does RankBrain Do?
This to me sort of suggests targeting long tail search terms may become less effective. Ie the direct matching text on a page may help less than it used to. If google is deciding a very specific search phrase is actually being better answered by a more generic and common search phrase.
I didn't find the right solution from the Internet.
References
http://forums.seochat.com/google-optimi ... 82057.html