tax query test

$tax_query = array(
	array(
		'taxonomy'         => 'grados',
		'terms'            => '9-grado',
		'field'            => 'slug',
	),
	array(
		'taxonomy'         => 'asignatura',
		'terms'            => 'espanol',
		'field'            => 'slug',
	),
);