Perhaps you should try some spelling variations:
"formelle avec." » "corneille avec.", "fermee avec.", "formelle des.", "armelle avec.", "formelles etvec."
"formelle und." » "formeln und.", "formale und.", "formel und."
"formelle a." » "armelle a.", "formelles et."

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: (("formelle avec.") OR ((("formelle a.") OR ("formelle und.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"formelle avec.\") or (((\"formelle a.\") OR (\"formelle und.\"))))".
• Removing quotes may allow a broader search: (( formelle avec. ) or ((( formelle a. ) OR ( formelle und. )))).
• Adding a wildcard symbol may retrieve word variants: (("formelle avec.") or ((("formelle a.") OR ("formelle und."))))*.