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

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: "tesi ((delle studien) OR (delphi studien)) de filosofia le literatura*".