Perhaps you should try some spelling variations:
filosofica da » filosofia da, filosofia de, filosofia di
filosofia la » filosofia da, filosofia le, filosofia das
des studie » des studien, desi studie, aes studies
studie der » studium der
tests des » test des, tests der, tests test

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 des studie der ((filosofia la) OR (filosofica da)) literatura*".