Perhaps you should try some spelling variations:
scale studien » scale studies, scale student, duale studien
ce literature » e literature, 2e literature, care literature
filosofia ce » filosofia de, filosofia e, filosofia le
tests scale » tests stable, sets scale, tests safe
3 filosofia » e filosofia, a filosofia, y filosofia
studien 3 » studien _, studien 4, studien 5