URLs that don’t have hash fragments
Actually, if your URLs are using AJAX without AJAX crawling scheme, you will be in the problem of not being indexed by Google and other search engines, if you are not indexed, then you will not appear in the search results.
AJAX crawling scheme means that you have to not use hash fragments, if you use hash this will lead to a non indexed URL.
However, Google is saying that they are working to introduce some new features that will make Googlebot able to index these URLs without help.
For the time being AJAX crawling scheme is the only available solution that can help to index your pages and hence can appear in the searches.