Pon un buscador google con resultados en tu misma web.
web
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<div id="cse" style="width: 100%;">
Cargando...
</div>
<script src="http://www.google.com/jsapi" type="text/javascript">
</script><script type="text/javascript">
//<![CDATA[
google.load('search', '1', {language : 'es'});
google.setOnLoadCallback(function() {
var customSearchControl = new google.search.CustomSearchControl('008552010937235570248:m_2thfk-pjw');
customSearchControl.setResultSetSize(google.search.Search.LARGE_RESULTSET);
var options = new google.search.DrawOptions();
options.setAutoComplete(true);
customSearchControl.draw('cse', options);
}, true);
//]]>
</script>rip