Perhaps you should try some spelling variations:
delphi studien » delphi studie, delphi study
des filosofia » de filosofia, e filosofia, di filosofia
da literatura » a literatura, de literatura, na literatura
la literatura » la litterature, a literature
belts delphi » bei delphi, parts delphi
studien des » studien der, studie des, studien aus

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 ((da literatura) OR (la literatura))*".