when I go to google dot com and type in site:mysite.com I scroll down and see the message In order to show you the most relevant results, we have omitted some entries very similar to the 593 already displayed. If you like, you can repeat the search with the omitted results included. So I understand I have 593 similar pages and google are not showing them in the results, But is there a way to find out what pages are similar so I can remove them from google?
I have had this problem before myself and the reason was due to duplicate content. It could be thinks like duplicated meta tags or duplicated content on the pages. Have a read of this page, http://support.google.com/gsa/answer/2672256?hl=en You should just ensure that all the pages on your site add valuable content to the web and are not just churned out content with different keywords.