Perhaps you should try some spelling variations:
"schriften _ burgerlichen rechts" » "schriften _ burgerliches recht", "schriften _ burgerliches rechts"
"schriften _ burgerlichen recht" » "schriften _ burgerliches recht"

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: "((\"schriften _ burgerlichen recht\") OR (\"schriften _ burgerlichen rechts\"))".
• Removing quotes may allow a broader search: (( schriften _ burgerlichen recht ) OR ( schriften _ burgerlichen rechts )).
• Adding a wildcard symbol may retrieve word variants: (("schriften _ burgerlichen recht") OR ("schriften _ burgerlichen rechts"))*.