$tax_query = array( 'relation' => 'AND', array( 'taxonomy' => 'media-category', 'terms' => '36', 'field' => 'term_id', 'operator' => 'IN', 'include_children' => true, ), array( 'taxonomy' => 'media-category', 'terms' => '37', 'field' => 'term_id', 'operator' => 'NOT IN', 'include_children' => false, ), );