Right Before RankBrain, Google didn’t have an understanding of synonyms and would return literal interpretations of a term. From Google: “…prior to we had State-of-the-art AI, our programs simply looked for matching text. By way of example, should you searched for “pziza” – Except there was a page with https://wiki-articles-backlinks77654.celticwiki.com/668410/the_site_ranking_google_ideas