$query = db_select('taxonomy_index', 't1');
    $query->distinct();
    $query->join('node', 't2', 't1.nid = t2.nid');
    $query->join('taxonomy_term_data', 't3', 't3.tid = t1.tid');
    $query->fields('t1', array('tid'));
    $query->fields('t3', array('name'));
    $query->fields('t1', array('nid'));
    $query->groupBy('t1.nid');
    $query->condition('t2.type', 'article', '=');
    $query->condition('t3.vid', '2', '=');
    $query->orderBy('t2.created', 'DESC');
    $query->range(0, 20);
    $result = $query->execute()->fetchAll();
    print_r($result);

tid  name   nid
1    apple   200
5    orange  165
9    grapes  130
5    orange  106

tid  name   nid
    1    apple   200
    5    orange  165
    9    grapes  130