Perhaps you should try some spelling variations:
peers studien » peer studie, peer studies, plebs studien
la literatura » la litterature, a literature
filosofia la » filosofia da, filosofia le, filosofica da
4 filosofia » e filosofia, a filosofia, y filosofia
best peers » best peer, best peere, best papers
studien 4 » studien _, studien 3, studien 5