Perhaps you should try some spelling variations:
safe studien » aue studien, lage studien, safe studio
filosofia ii » filosofia di, filosofica di, filosofia e
filosofia de » filosofia del
studien das » studie das, studien des, studien der
tests safe » tests safety, tests scale, tests space

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: "tests safe studien das ((filosofia ii) OR (filosofia de)) literature*".