Google Supplemental Index
Most people wouldn't be aware that Google has a main search result database and a supplemental database (I'm using the term database rather than index, to help keep the explanation simple).
When you search for something in Google, it will generally only return results from its main database. If your query is obscure or there are not many results, Google may dip into its supplemental database to give you a few more results.
The supplemental database has had negative connotations within the search engine optimisation community. Often sites, that have been penalised by Google will have their web pages dumped into the supplemental results database. Other reasons can relate to lack of quality back links to those pages making them less important than other pages. Either way, it's not considered a good thing because your pages are unlikely to be shown in normal query results.
The problem is that your website is at the mercy of Google - if they decide that your pages should be in the supplemental index, then that's it. Don't panic though, it's not necessarily permanent. Generally new web pages will start out in the supplemental database, which is also often referred to as 'the sandbox'.
Results coming from the supplemental database have an additional note in their listing within Google - "supplemental result".... well at least until a few weeks ago.
- Make sure your pages are different (page titles, headings and content)
- Have unique URLs rather than ?product_id=12&category=13
- Have a good amount of content
- Make sure your pages don't link to dead end pages
- Get links from other reputable web sites
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