Our intention is to not autocorrect searches. That is, we intend to completely respect the query you type in, and (in some cases) display a Did you mean? link at the top when relevant.
However, there are a few outstanding major bugs in this area that we are working to resolve. As a result, you may see some autocorrect behavior in the search results.
Unfortunately, these bugs involve a bunch of APIs that are mostly out of our control. We are both working around these bugs and also working to get them fixed .
For some queries, it has been a little slow to resolve, but rest assured that this is a top priority. In any case, specific examples always help as we may be able to easily add more workarounds.
Prior versions on GitHub.