Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
der filosofia » de filosofia, e filosofia, di filosofia
scale studie » scale studies, scale studien, scale study
tests scale » tests stable, sets scale, tests safe
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 literatura) OR (la literatura)).
• Adding a wildcard symbol may retrieve word variants: tests scale studie der filosofia ((y literatura) or (la literatura))*.