Perhaps you should try some spelling variations:
stable studien » stadler studien, scale studien, table studies
ii literature » ii literatur, i literature, vii literatur
tests stable » tests table, sets stable, test table
de filosofia » e filosofia, di filosofia, la filosofia
filosofia ii » filosofia di, filosofica di, filosofia de
studien de » studien der, studien die, studien des