Yesterday Google was having some error with their search engine. Maxim yesterday reported to Google that he is receiving a strange kind of SERPs from Google when he is trying to search on google.ru with “site:www”. Later Philipp Lenssen from Google Blogoscoped posted it and was still unsure that was it an error or what. The results on SERPs were showing the urls of the results as “www/google/com” instead of “www.google.com”. You can see the screenshot below.
Source [Google Blogoscoped]