Perhaps you should try some spelling variations:
peers studien » peer studie, peer studies, plebs studien
de literatura » de litterature, a literatura
la literatura » la litterature, a literature
4 filosofia » e filosofia, a filosofia, y filosofia
best peers » best peer, best peere, best papers
studien 4 » studien _, studien 3, 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 peers studien 4 filosofia ((de literatura) OR (((y literatura) OR (la literatura)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "best peers studien 4 filosofia ((de literatura) or (((y literatura) OR (la literatura))))".
• Adding a wildcard symbol may retrieve word variants: best peers studien 4 filosofia ((de literatura) or (((y literatura) OR (la literatura))))*.