function jma_search_filter( $query ) {/* exclude book specials from search */
  if ( ! $query->is_admin && $query->is_search && $query->is_main_query() ) {
    $query->set( 'post__not_in', array( 1565, 1540 ) );
  }
}
add_action( 'pre_get_posts', 'jma_search_filter' );