Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
studenten als » studenten des, studenten a, studenten das
studenten auf » studenten fur, studenten zur, studenten a
sets den » sets des, sets deep, sets does

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: "sets den ((studenten als) OR (studenten auf)) filosofia del literatura*".