Just fyi, the database that is used for the site:domain.com is actually not the same database that they use for live searches.

So you may see a certain number of pages using the site: command but not or less pages may be indexed.

If you want pages indexed, out then in an xml sitemap file, make sure there are internal links to them on your site, and external links from other sites really helps. Third party indexer tools help as well.