Perhaps you should try some spelling variations:
der filosofia » de filosofia, e filosofia, di filosofia
la literatura » la litterature
ideas studie » ideas studies, deas studies, areas studio
test ideas » best ideas, test idea, test items
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: "test ideas studie der filosofia ((la literatura) OR (a literature))".
• Adding a wildcard symbol may retrieve word variants: test ideas studie der filosofia ((la literatura) OR (a literature))*.