Probably because Google either hasn't indexed your hubs, or your hubs aren't ranking well, yet. Since you've only been on hubpages a little more than a week, I would suspect it is a combination of both.
Consider submitting the URL's of your hubs to Google and other search engines, and also consider submitting a sitemap of your hubs to Google once you have 10 hubs. Here is a very easy to follow hub about submitting your sitemap to Google
Submitting your hub URL's to Google, and eventually submitting a sitemap will greatly improve the speed at witch Google will index your hubs.
As far as ranking your hubs in search results, that will take some time and whatever effort you wish to put into it.
Bottom line, give Google some time to find your hubs, they are relatively new.