Perhaps you should try some spelling variations:
stable studien » stadler studien, scale studien, table studies
iii literature » ii literature, iii literatur, viii literatur
filosofia iii » filosofia di, filosofia del, filosofia de
tests stable » tests table, sets stable, test table
es filosofia » e filosofia, em filosofia, la filosofia
studien es » studien aus, studien bei, studien ein