Lấy tất cả custom taxonomy parent, custom taxonomy child, custom taxonomy (ok)

$taxonomies = array(
  'genre'
);
$args = array(
  'orderby'                => 'name'
);
$terms = get_terms($taxonomies, $args);
foreach ($terms as  $term) {
	if($term->parent === 0) {
		echo $term->name . "<br/>";
	}
}

$taxonomies = array(
  'genre'
);
$args = array(
  'orderby'                => 'name'
);
$terms = get_terms($taxonomies, $args);
foreach ($terms as  $term) {
	echo $term->name . "<br/>";
}