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
3 filosofia » e filosofia, a filosofia, y filosofia
best peers » best peer, best peere, best papers
studien 3 » studien _, studien 4, studien 5