Perhaps you should try some spelling variations:
y filosoficos » y filosofico, y filosofia, e filosofica
la literatura » la litterature, a literature
a literatura » a literature, y literatura, a literatur
de studie » die studie, de studio, e studie
studie y » studie 2, studie _, studie 1
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 ((a literatura) OR (la literatura))".
• Adding a wildcard symbol may retrieve word variants: test de studie y filosoficos ((a literatura) OR (la literatura))*.