@Sarah:
The "Advanced Search" link at the bottom of the search results page is not equivalent to the "Advanced Search" button.  It takes you to a totally different page, which has a totally different format, is harder to read, and lacks, *inter alia*, the "number of results" option.  None of the 3 links referenced by @aygul points to the original advanced search page either.  Please have one of your support people try to find the fix to get the old way back!