How many sub-pages you have included in Google, Yahoo and Bing is an indicator of how visible and important your site is. If you are not indexed, ie: included, you cannot be found either.
Make sure all your web pages are included in Google, Bing and Yahoo.
Determine indexation
To get all your web pages indexed or included in search engines, the first step is to consider search engine optimisation. Before you are found, you don’t exist for search engines and therefore cannot be found by any users either.If you for instance publish 20 pages, but only 10 are found in Google, there might be some kind of technical problem with your site. It also may be because you have no internal or external links pointing to your newly published content, or there might be duplicate content issues.
How many indexed pages do you have?
It’s simple to check out how many indexed pages your websites got. Simply type ‘site:www.yoursite.co.uk’ (change to the name of your own website) in Google, Bing or Yahoo:Why care about the amount of indexed pages?
As mentioned before, only pages that are indexed can be found. A large collection of indexed pages can give the impression of authority to search engines. Websites with large amounts of content and indexed pages are often ranked better than small sites.How to get your website indexed fast?
-Inbound Links: Make sure to get many incoming links from trustworthy sources.-Sitemap: Submit a XML-sitemap in Google Webmaster Tools and Bing Tools.
-Internal Links: Make sure at least one link points to your new content.
Source:http://www.seospecialist.co.uk/school/analysis/indexed-pages/