Perhaps you should try some spelling variations:
filosofica la » filosofica da, filosofia la, filosofia da
la literatura » la litterature, a literature
tests scale » tests stable, sets scale, tests shall
tests safe » tests safety, tests space, tests tafel
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 safe) OR (tests scale)) ((studie die) OR (studie der)) filosofica la literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tests safe) OR (tests scale)) ((studie die) or (studie der)) filosofica la literatura".
• Adding a wildcard symbol may retrieve word variants: ((tests safe) OR (tests scale)) ((studie die) or (studie der)) filosofica la literatura*.