Perhaps you should try some spelling variations:
la literature » la litterature, a literature, la literatura
filosofia la » filosofia da, filosofia le, filosofica da
tests scale » tests stable, sets scale, tests safe
studien e » studien es, studien _, studien 4
studien 3 » studien _, studien 4, studien 5

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 scale ((((studien e) OR (studien 3))) OR (((studien e) OR (studien 3))in)) filosofia la literature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tests scale ((((studien e) OR (studien 3))) or (((studien e) OR (studien 3))in)) filosofia la literature".
• Adding a wildcard symbol may retrieve word variants: tests scale ((((studien e) OR (studien 3))) or (((studien e) OR (studien 3))in)) filosofia la literature*.