How can Bootstrap glyphicons be marked up using Jade?

I tried to add glyphicons at my HTML, something important to say is that I'm redering from Jade.

For inside buttons glyphicons I tried:

button(ng-click='doLexycalValidation()').btn.btn-default 
    span.glyphicon.glyphicon-search
    | Evalular

For glyphicons at tables I tried:

tr.table.table-hover
    td
    span.glyphicon.glyphicon-search
    | Evalular

But got not result at any of these. I'm importing Bootstrap from CDN this way:

link(rel='stylesheet', href='https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css')
link(rel="stylesheet",href="//netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.css")

How can I make them work properly?