Perhaps you should try some spelling variations:
des filosofia » e filosofia, di filosofia, da filosofia
de filosofia » e filosofia, di filosofia, la filosofia
y literatura » la literatura
den studium » dein studium, dem studium, des studium
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 ((des filosofia) OR (de filosofia)) y literatura*".