It all takes time to build up your adsense ads revenue, it is quite normal to have no clicks, when you start out, 4 hubs, isn't directly going to make you much money to start with
2th, your hub needs some time to get ranked in the search engines, so if that isn't the case yet, you won't get much visitors unless from hubpages itself, so less traffic, less click trough.
The $0,01 thing you see in your account, is the CPM, or cost per impression, this entails, that you get $ 0,01 for every 1000 page impressions in total. So, when your 4 hubs get a total of 1000 views, you get the $0,01. When people click on an adsense ad on your hub, that money comes on top of the CPM.
To get a bunch of ad clicks, you need to build up your content, what i mean by that, is when you have 4 hubs, you get let's say 20 views or impressions per day. And maybe 1 click per week.
When you have 200 hubs, you get at least 400 views per day, so way more chances to get clicks.
Hope this helped you out a bit. If you need more info, you can always visit my profile, you'll find plenty of adsense related hubs.