Perhaps you should try some spelling variations:
y literatura » la literatura
filosofia y » filosofia e, filosofia _, filosofia de
best peer » best peere, best peep, best paper
studien l » studien _, studien 4, studien 5
studien 3 » studien _, studien 4, studien 5

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: best peer ((studien l) OR (studien 3)) filosofia y literatura.
• Adding a wildcard symbol may retrieve word variants: best peer ((studien l) or (studien 3)) filosofia y literatura*.