Referência #1

<div id="cse" style="width: 100%;">Loading</div>
<script src="https://www.google.com/jsapi" type="text/javascript"></script>
<script type="text/javascript">
  google.load('search', '1', {language : 'pt-BR', style : google.loader.themes.ESPRESSO});
  google.setOnLoadCallback(function() {
    var customSearchControl = new google.search.CustomSearchControl('003651604338862546861:avsfhtuf8cm');
    customSearchControl.setResultSetSize(google.search.Search.FILTERED_CSE_RESULTSET);
    customSearchControl.draw('cse');
  }, true);
</script>