Perhaps you should try some spelling variations:
forschungsbericht zum » erfahrungsbericht zum
land nordrhein » landes nordrhein
lane nordrhein » lande nordrhein, landes nordrhein, mann nordrhein
3 landes » 3 landau, 3 lane, 3 lange

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: "((\"forschungsbericht ((3 landes) OR (3 land)) nordrhein-westfalen\") or (\"forschungsbericht zum ((lane nordrhein) OR (land nordrhein))-westfalen\"))".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"forschungsbericht ((3 landes) or (3 land)) nordrhein-westfalen\\") or (\\"forschungsbericht zum ((lane nordrhein) OR (land nordrhein))-westfalen\\"))\"".
• Removing quotes may allow a broader search: (( forschungsbericht ((3 landes) or (3 land)) nordrhein-westfalen ) or ( forschungsbericht zum ((lane nordrhein) OR (land nordrhein))-westfalen )).