Perhaps you should try some spelling variations:
la litterature » a literature
la literatura » a literature
peer studie » peer studies, peers studien, der studie
4 filosofia » e filosofia, a filosofia, y filosofia
best peer » best peere, best peep, best paper
studie 4 » studie 2, studie _, studie 1

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 4 filosofia ((la literatura) OR (la litterature))".
• Adding a wildcard symbol may retrieve word variants: best peer studie 4 filosofia ((la literatura) OR (la litterature))*.