Perhaps you should try some spelling variations:
filosofiche da » filosofica da, filosofiche e, filosofiche lo
da literatura » la literatura, a literatura, de literatura
tests scale » tests stable, sets scale, tests safe
studien es » studien aus, studien bei, studien ein
studien e » studien _, studien 3, studien 4

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 scale ((studien e) OR (studien es)) filosofiche da literatura".
• Adding a wildcard symbol may retrieve word variants: tests scale ((studien e) OR (studien es)) filosofiche da literatura*.