When you search, especially for topics that you know little about, chances are that you might not include the most relevant terms in your query, or you might use words that may have ambiguous meanings.
http://www.seobythesea.com/2013/09/google-reform-queries-based-co-occurrence-query-sessions/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+seobythesea%2FTesr+%28SEO+by+the+Sea%29
http://www.seobythesea.com/2013/09/google-reform-queries-based-co-occurrence-query-sessions/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+seobythesea%2FTesr+%28SEO+by+the+Sea%29