Perhaps you should try some spelling variations:
stadler studien » realer studien, stifter studien, studie studien
tests stadler » tests stable, 21st stadler, teste stadien
ii literature » ii literatur, i literature, vii literatur
filosofia ii » filosofia di, filosofica di, filosofia de
e filosofia » la filosofia
studien e » studien es, studien _, studien 3