Perhaps you should try some spelling variations:
scale studien » scale studies, scale student, duale studien
la literatura » la litterature
de filosofia » e filosofia, di filosofia, la filosofia
tests scale » tests stable, sets scale, tests safe
studien de » studien der, studien die, studien des

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 de filosofia ((la literatura) OR (a literature)).
• Adding a wildcard symbol may retrieve word variants: tests scale studien de filosofia ((la literatura) or (a literature))*.