This isn't available and I don't think it's going to be made available.

> Searches are too performance intensive to be RSS feeds.
> 
> If you can't express your search as a set of tags ([we support and/or
> in tags, see the
> blog](http://blog.stackoverflow.com/2008/10/tags-and-tags-or-tags/)),
> which *does* have an RSS feed, I humbly submit you aren't trying hard
> enough. :)

[Reference][1]


  [1]: https://meta.stackexchange.com/questions/5857/rss-feed-for-searches