Perhaps you should try some spelling variations:
ds filosofica » di filosofia, de filosofia, da filosofia
de literatura » de litterature, y literatura, a literatura
la literatura » la litterature, a literature
tesi delle » testi delle, testi della, beni delle
test delle » testi delle, test della, testa 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: ((tesi delle) OR (test delle)) studies ds filosofica ((de literatura) OR (la literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tesi delle) OR (test delle)) studies ds filosofica ((de literatura) or (la literatura))".
• Adding a wildcard symbol may retrieve word variants: ((tesi delle) OR (test delle)) studies ds filosofica ((de literatura) or (la literatura))*.