Perhaps you should try some spelling variations:
della studien » cella studie, delphi studien, modell studien
filosofia la » filosofia da, filosofica da, filosofia das
filosofia le » filosofia de, filosofia e, filosofia del
test della » testa della, testi della, test delle
studien la » studien lap, studien a, studien l

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 della studien la ((filosofia la) OR (filosofia le)) literatura".
• Adding a wildcard symbol may retrieve word variants: test della studien la ((filosofia la) OR (filosofia le)) literatura*.