Perhaps you should try some spelling variations:
la litterature » a literature
della studien » cella studie, delphi studien, modell studien
la literatura » a literature
testi della » test della, testa della, testi delle
a filosofia » la filosofia, e filosofia, di filosofia
studien a » studien am, studien _, studien 3

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: "testi della studien a filosofia ((la literatura) OR (la litterature))".
• Adding a wildcard symbol may retrieve word variants: testi della studien a filosofia ((la literatura) OR (la litterature))*.