query_posts(
                    array_merge(
                        $wp_query->query,
                        array( 'post_type' => array('post', 'cm_courses'),
                            'tax_query' => array(
                            array(
                                'taxonomy' => 'keyaspects',
                                'field' => 'name',
                                'terms' => 'Alterszahnheilkunde',
                            )
                        ) ,'paged' => $paged, 'posts_per_page' => $items_per_page)
                    )
                );