Here is an example:
Recently, we were asked why Googles "Did You Mean" showed a different result for a company name when they Google their company name. With a little research this is what we found out.
Google uses spell checking software to check queries, ie (cennethelp) against common spellings of each word. When Google determines an alternative query that they think might improve the search results, you'll see "Did you mean: (more common spelling)" at the top of your search results page. This happens when a site has no relevance, no direct entries into Google and no dictionary reference for that specific word and not enough backlinks to the site.