[josevalim]

My understanding (which may be wrong) from the exchange is that they literally search for "elixir programming" on several websites, including Amazon. So it is very sensitive to whatever changes those websites do to their own search engines. I can no longer reproduce the behaviour from back then but it is very understandable that websites like Amazon are optimizing their search results for sales and other key metrics rather than term precision.

[nindalf]

Your understanding is correct. Their methodology is really that silly and susceptible to wild swings.