Perhaps you should try some spelling variations:
y literatura » la literatura
filosofia y » filosofia e, filosofia _, filosofia de
besten der » bestehen der, bestimmen der, bestehens der
studie am » studie 2, studie 1, studie 3
studie a » studie 2, studie 1, studie 3

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

• If you are trying to use Boolean operators, they must be ALL CAPS: besten der ((((studie a) OR (studie am))) OR (studie _)) filosofia y literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "besten der ((((studie a) OR (studie am))) or (studie _)) filosofia y literatura".
• Adding a wildcard symbol may retrieve word variants: besten der ((((studie a) OR (studie am))) or (studie _)) filosofia y literatura*.