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

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((essener beitrage) OR (segner beitrage)) zur dialogforschung.
• Adding a wildcard symbol may retrieve word variants: ((essener beitrage) or (segner beitrage)) zur dialogforschung*.