Perhaps you should try some spelling variations:
e literatura » de literatura, y literatura, e literatur
peer studie » peer studies, peers studien, over studie
2 filosofia » e filosofia, a filosofia, y filosofia
filosofia e » filosofia de, filosofia del

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: "best ((peer studie) OR (der studie)) 2 filosofia e literatura".
• Adding a wildcard symbol may retrieve word variants: best ((peer studie) OR (der studie)) 2 filosofia e literatura*.