Perhaps you should try some spelling variations:
e literatura » de literatura, y literatura, e literatur
e filosofia » la filosofia
filosofia e » filosofia de, filosofia del
test duale » test double, test orale, test doubles
test delle » testi delle, tesi delle, test della
studien e » studien es, 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: "((test duale) OR (test delle)) studien e filosofia e literatura".
• Adding a wildcard symbol may retrieve word variants: ((test duale) OR (test delle)) studien e filosofia e literatura*.