Perhaps you should try some spelling variations:
filosofia life » filosofia de, filosofia e, filosofia di
filosofia le » filosofia de, filosofia e, filosofia del
studien des » studien der, studie des, studien aus
test duale » test double, test delle, test orale
studien de » studien der, studien die, studien dd

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: test duale ((studien de) OR (studien des)) ((filosofia life) OR (filosofia le)) literature*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "test duale ((studien de) OR (studien des)) ((filosofia life) or (filosofia le)) literature*".