This is a good point. I searched for "rename" today and the top result switched it to "name" instead. The TOP result completely changed the query. Infuriating.

I also love when my search is narrow enough that Google instead starts to return more generic pages for totally different programming languages instead of the smaller result set that matches exactly. It is very easy to observe as you explore a topic. At some point, you got a wall where any increase in search specificity seems to yield worse results than queries that helped you get to that point.