Perhaps you should try some spelling variations:
delphi studien » delphi studie, delphi study
des filosofia » e filosofia, di filosofia, da filosofia
da literatura » la literatura, a literatura, de literatura
belts delphi » bei delphi, parts delphi
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: "belts delphi studien ((des filosofia) OR (de filosofia)) da literatura*".