query by

// WP_Query arguments
$args = array(
	'order'                  => 'ASC',
	'orderby'                => 'id',
	'tax_query'              => array(
		array(
			'taxonomy'         => 'series',
			'terms'            => 'series',
			'field'            => 'term_id',
			'operator'         => 'IN',
			'include_children' => true,
		),
	),
);

// The Query
$query = new WP_Query( $args );