font awesome only partly working

I am using a Drupal theme with font awesome. I can only assume something changed because if I use an icons with the format of (fa-""-"") it will not show or shows the unicode depending on the browser. 

example: the code would look like this and would work fine- icon="fa fa-truck"
if you use icon="fa fa-pie-chart" it will not show.

I do not know the terminology to explain a two word or three word icon would be called. It also works if there is a four letter icon like "fa-file-text-o"

Here is a sample page in question http://valve.park3d.com/content/11delete is there a way to fix this? I would be happy to know the terminology of what to look for.