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.

Hello park3d,

Please follow with the icon shortcode syntax

[icon class="fa fa-home"][/icon]

Please use this syntax for display icon.

Thanks!

Using this is not the problem becuase the line you suggested [icon class="fa fa-home"][/icon] works fine. However if I added "fa fa-pie-chart" it will not work because it is an icon that has an second word. If it has a third word that work such as "fa fa-share-square-o" works fine also. 

So nowhere in the entire site can I use icons like this fa-line-chart, fa-sor-asc, fa-send-o, and so on.