Perhaps you should try some spelling variations:
le literature » e literature, 2e literature, ce literature
tests stable » tests table, sets stable, test table
filosofia le » filosofia de, filosofia e, filosofia del
studien aus » studie aus
studien es » studien bei, studien ein, studien als
studien e » studien _, studien 3, studien 4

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: tests stable ((studien e) OR (((studien es) OR (studien aus)))) filosofia le literature*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tests stable ((studien e) or (((studien es) OR (studien aus)))) filosofia le literature*".