Lufrutta

Add the following function to the functions.php of your theme, if you want to search in posts, pages and faqs:

function fb_search_filter($query) {
 if ( !$query->is_admin && $query->is_search) {
 $query->set('post_type', array('post', 'page', 'hrf_faq') );
 }
 return $query;
 }
 add_filter( 'pre_get_posts', 'fb_search_filter' );

If you just want to search in the faqs change
$query->set('post_type', array('post', 'page', 'hrf_faq') );
to
$query->set('post_type', array('hrf_faq') );