IDG Answers is a community of experts who are passionate about technology. Ask a question or answer one below.
You can always examine your search data using a spreadsheet. Then you can examine the data in whatever fashion you like and in any way that provides meaningful insight. One way you can utilize it is to see what search queries get used most often and which common queries fail and return no results. Over time this can allow you to quantify what is of most interest to your website's visitor, how it changes, and what they are looking for from you, but not finding.