What does it mean?

You just enter a search request, and attempts to save the results as a bookmark. Although it may appear as a separate address, the result is not a legitimate URL, so you can add it to your list of bookmarks.

What can you do about it?

Try to save the results page in the HTML pages on your hard disk. Use the Save As command and then add it to your bookmark list to keep pages. According to CGI script behind the query, you may or may not succeed. But it is worth a try.