Perhaps you should try some spelling variations:
der filosofia » de filosofia, e filosofia, di filosofia
de literatura » de litterature, la literatura, y literatura
filosofia de » filosofia del
tests space » test space, lists space, meets space
texts space » text space, meets space, sets space
studie der » studium der

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 space) OR (texts space)) studie der filosofia de literatura".
• Adding a wildcard symbol may retrieve word variants: ((tests space) OR (texts space)) studie der filosofia de literatura*.