Perhaps you should try some spelling variations:
life literature » polite literature, prose literature
delphi studien » delphi studie, delphi study
filosofia life » filosofia le, filosofia de, filosofia e
delle studien » duale studien, modell studien, welche studien
de filosofia » e filosofia, di filosofia, la filosofia

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 ((delle studien) OR (delphi studien)) de filosofia life literature*".