When you look at your My Stats page, you’ll see your stats for that day. So if you don’t see any search engine terms there, it just means that we haven’t recorded any search engine hits for that day.
You can see all of the search engine terms used to get to your blog by clicking the “Summaries” link in the top right of the Search Engine Terms box. There, you can click on “All time” to see a list of search engine terms used since you started your blog.
If you’re interested in improving your search engine rankings (to try to help your blog appear higher in the search results) you may want to check out these links: