Bloglines Search tool is the easiest. Syndic8 is the most confusing. Other tools which I found were "Search4rss" and "News is free" but they were slower than my old obsessive Mom. ( only kidding..)
Topix was a useful search tool when trying to find local news about Exton and nearby news. I found a Staffordshire Terrier Club in Reading that my Moms could join.