Perhaps you should try some spelling variations:
essener beitrage » essen beitrage, eigenes beitrage, segner beitrage
wiener beitrage » dieser beitrage, eigenes beitrage, neuer beitrage
dialogforschung » dialektforschung

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: "((wiener beitrage) OR (essener beitrage)) zur dialogforschung".
• Adding a wildcard symbol may retrieve word variants: ((wiener beitrage) OR (essener beitrage)) zur dialogforschung*.