Perhaps you should try some spelling variations:
"waste as 2 ressourcen" » "waste as 1 ressourcen", "waste as 7 ressourcen", "waste as _ ressourcen"
"waste as a ressource" » "waste as a resource", "waste as 4 ressource", "waste as als ressource"
"waste as _ ressource" » "waste as _ ressourcen", "waste as _ resource", "waste as 7 ressourcen"

Try widening your search to All Fields.

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: (("waste as a ressource") OR ((("waste as _ ressource") OR ("waste as 2 ressourcen")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"waste as a ressource\") or (((\"waste as _ ressource\") OR (\"waste as 2 ressourcen\"))))".
• Removing quotes may allow a broader search: (( waste as a ressource ) or ((( waste as _ ressource ) OR ( waste as 2 ressourcen )))).
• Adding a wildcard symbol may retrieve word variants: (("waste as a ressource") or ((("waste as _ ressource") OR ("waste as 2 ressourcen"))))*.