We (our company) really love the fact how straight forward confluence is. Especially our technically not so well versed users. So, it is a great thing you can also search for multiple labels without modifying the URL or working with advanced search querys like "labelText:[label1] and .. and labelText:[label_n]".
Unfortunately this isn't obvious at all.

Here's an example (please also have a look at the picture):
Let's say I'm on a page in the space documenting the tools used in our company. There I see a "confluence" label and I'd like to get a list of all user tips concerning confluence.
So i click on the "confluence" label (1.)
Now I'm redirected to the next page (2.). At the top you know see "Label: confluence". Well, this makes sense. I clicked on the "confluence" label so I expected to be redirected to this page. But I also wanted to narrow the search down to tips (or "tipps" in German).
Sure I can see "tipps" listed in the "related labels" column. But since I got to "Label: confluence" by clicking on "confluence" just a few seconds ago, I naturally assume I will get to "Label: tipps" by clicking on "tipps". And that this page would list tips for every tool documented. Because that isn't what I want, I won't click it and there really is no hint at all that clicking "tipps" would exactly achieve what I want and works different than on the page before in the way that it further narrows down the search and doesn't just list all entries with a "tipps" label.

If I click on "tipps" anyway I get the "Label:confluence+tipps" page (3.) and that's great and all I wanted since the beginning but I honestly see no way to get to this conclusion other than just trying/guessing.

I'm sorry If my text may be a bit confusing but I hope you'll understand what I'm trying to say and agree with me in that this behavior should be made more clear. Perhapes with a hint like "To narrow the search further down you may click on one of the following labels: ...".
Or just implement check boxes like suggestet in http://jira.atlassian.com/browse/CONF-4577