Perhaps you should try some spelling variations:
scale studie » scale studies, scale studien, scale study
tests scale » tests stable, sets scale, tests safe
filosofia y » filosofia _, filosofia de, filosofia da
filosofia e » filosofia de, filosofia del
studie der » studium der

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 studie der ((filosofia y) OR (filosofia e)) literatura.
• Adding a wildcard symbol may retrieve word variants: tests scale studie der ((filosofia y) or (filosofia e)) literatura*.