Perhaps you should try some spelling variations:
y filosoficos » y filosofico, e filosofica, e filosofiche
a literatura » la literatura, a literature, y literatura
y filosofia » e filosofia, a filosofia, la filosofia
de studie » die studie, de studio, e studie
test de » test der, test des, est de

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "test de studie ((y filosoficos) OR (y filosofia)) a literatura*".