Angular: Empty Fiddle

http://angularjs.org/

HTML

<script src="http://code.angularjs.org/1.0.8/angular.min.js"></script>
<div ng-controller="MyCtrl">
<input type="text" placeholder="Nome do usuário" ng-model="search_nome">
 <select ng-model="search_turmas.turmas.value">
        <option value="!!">Todos</option>
        <option ng-repeat="option in listTurmasFilter" value="{{option.value}}">{{option.title}}</option>
    </select>
    <table>
        <thead>
            <tr>
                <th>ID</th>
                <th>Nome</th>
                 <th>Turmas</th>
            </tr>
        </thead>
        <tbody>
            <tr ng-repeat="usuario in dadosUserAndTurma | filter:{nome:search_nome}">
                <td>{{usuario.idUser}}</td>
                <td>{{usuario.nome}}</td>
                 <td><span ng-repeat="trm in usuario.turmas">
                             &nbsp;[ {{trm.turma}} ]&nbsp;
                     </span></td>
            </tr>
        </tbody>
    </table>
</div>

CSS

thead th {
    font-weight: bold;
    height: 40px;
}

JavaScript

function MyCtrl($scope) {

    $scope.listTurmasFilter = [
		{title: "Turma 1", value: 1},
		{title: "Turma 2", value: 2},
		{title: "Turma 3", value: 3}
	];
  
  $scope.search_nome = "";

   $scope.search_turmas = {
                         turmas:{
                               value:"!!"
                         }
                };
  $scope.filterTurma = function() {
    $scope.search_turmas = $scope.changeTurma;
  };

	$scope.dadosUserAndTurma = [
                  {
                    idUser:20,
                    nome: "Carlos",
		                turmas: [
                             {turma: "Turma 1", value: 1},
		                         {turma: "Turma 2", value: 2},
		                         {turma: "Turma 3", value: 3}
	                           ]
                  },
                  {
                    idUser:21,
                    nome: "Luiz",
		                turmas: [
                             {turma: "Turma 1", value: 1},
		                         {turma: "Turma 3", value: 3}
	                           ]
                  },
                  {
                    idUser:22,
                    nome: "Priscilla",
		                turmas: [
                             {turma: "Turma 2", value: 1}
	                           ]
                  } ,
                 {
                    idUser:24,
                    nome: "Pedro",
		                turmas: []
                  }
              ];
              
}