Perhaps you should try some spelling variations:
filosofia de » filosofia del
den studium » dein studium, dem studium, des studium
filosofia y » filosofia e, filosofia _, filosofia da
studium di » studium die, studium i, studium ii
text den » text der, text des, text daten

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: "text den studium di ((filosofia y) OR (filosofia de)) literatura*".