What’s the best way to search this blog? It probably isn’t to use the built-in search box. Sometimes that option works fine, but sometimes not so well (or not at all.)
Instead, you might want to try using the “Advanced Search” in Google. In the bottom half of the Advanced Search options appears an option labeled “site or domain.” There you can enter phippsgenealogy.wordpress.com after you’ve entered your search terms near the top of the page.