AngularJS + PHP search Parse html

i've been working on a small project that includes a simple search engine with PHP + AngularJS.

The problem is that when the keyword doesn't exists in an array it fires an error message which include HTML code. The HTML code doesn't seem to be parsed by itself, i just get plain html code.

Here's my code so far [AngularJS]

  function searchRares($scope, $http) {
  $scope.url = 'search.php';

  $scope.search = function() {

    $http.post($scope.url, { "data" : $scope.keywords}).
    success(function(data, status) {
      $scope.status = status;
      $scope.data = data;
      $scope.result = data;
    })
    .
    error(function(data, status) {
      $scope.data = data || "Bad response";
      $scope.status = status;     
    });
  };
}

My php file [search.php]

<?php
$data    = file_get_contents("php://input");
$key     = json_decode($data);

$words = ['stackoverflow', 'ask', 'answer'];

if(!in_array(strtolower($key->data), $words))
{
    echo"
    <div class=\"ui error message\">
         Not found
        </div> ";
}
else
    echo $key->data;
?>

(edit) I forgot the html code

<div class="ui raised form segment" ng-controller="searchRares">


    <div class="ui action input">
      <input type="text" ng-model="keywords" placeholder="KeyWord..">
       <div class="ui blue right labeled icon button" ng-click="search()"> Search </div>   
   </div>

<div ng-model="result">
{{result}}
</div>
</div>

Any help would be appreciated! Thanks - Eraik