Perhaps you should try some spelling variations:
der filosofia » de filosofia, e filosofia, di filosofia
ideas studies » deas studies, beams studies, beads studies
ideas studie » deas studies, areas studio, evas studie
filosofia a » filosofia da, filosofia la, filosofia e

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: test ((ideas studie) OR (ideas studies)) der filosofia a literature.
• Adding a wildcard symbol may retrieve word variants: test ((ideas studie) or (ideas studies)) der filosofia a literature*.