Perhaps you should try some spelling variations:
der filosofica » de filosofia, e filosofica, e filosofia
filosofica da » filosofia da, filosofia de, filosofia di
da literatura » la literatura, a literatura, de literatura
tests scale » tests stable, tests safe, tests shall
studien der » studie der, studenten der
sets scale » sets scaled, sets scales, set scale

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) OR (sets scale)) studien der filosofica da literatura".
• Adding a wildcard symbol may retrieve word variants: ((tests scale) OR (sets scale)) studien der filosofica da literatura*.