First make sure your hubs are indexed. To do that you can simply type in google search:
If there are indexed you will see your site there, but if they do not appear in the top results it means that you need to optimized them better.
If doing the above doesn't show any results maybe
a/ your hubs are new and google didn't pay them a visit
b/ they are not new, but you will need to send your site adress manually to google. You can do it by submitting it. Just type "submit site to google" and after that is easy.