filter multiple checkbox angular

I am trying to filter my results on multiple checkboxes.

Here is my JSFIDDLE

<div ng-app>
    <div ng-controller="MainCtrl">

   <li ng-repeat="o in languages" ng-model="lang.language.name">
      <input type="checkbox">
      ,
  `</li>

   <br><br><br>
   <li ng-repeat="o in bu">
      <input type="checkbox" ng-model="bu.business_unit.name">
      ,
  `</li>

  <br><br><br>
  <div ng-repeat="arr in array filter : lang | filter : bu">
       "and" 
  </div>

<div>

How do i write dynamic ng-model for the checkboxes for the filter to take reflect?