Perhaps you should try some spelling variations:
"fachgruppe fur/steine/erden" » "fachgruppe fur/steiner/erden", "fachgruppe fur/steine/erde", "fachgruppe fur/steine/erben"
"fachgruppe fur/steine/orden" » "fachgruppe fur/steiner/orden", "fachgruppe fur/steine/order"

Try widening your search to All Fields.

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: "((\"fachgruppe fur/steine/erden\") OR (\"fachgruppe fur/steine/orden\"))".
• Removing quotes may allow a broader search: (( fachgruppe fur/steine/erden ) OR ( fachgruppe fur/steine/orden )).
• Adding a wildcard symbol may retrieve word variants: (("fachgruppe fur/steine/erden") OR ("fachgruppe fur/steine/orden"))*.