Perhaps you should try some spelling variations:
le literatura » la literatura, e literatura, de litteratura
de literatura » de litterature, la literatura, y literatura
testi della » test della, testi delle, reti della
testa della » resta della, test della, eta della

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: ((testi della) OR (testa della)) studien _ filosofia ((le literatura) OR (de literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((testi della) OR (testa della)) studien _ filosofia ((le literatura) or (de literatura))".
• Adding a wildcard symbol may retrieve word variants: ((testi della) OR (testa della)) studien _ filosofia ((le literatura) or (de literatura))*.