Perhaps you should try some spelling variations:
"willy literaturlexikon" » "wiley literaturlexikon", "dilly literaturlexikon", "willi literaturlexikon"
"wills literaturlexikon" » "bills literaturlexikon", "hills literaturlexikon", "wells literaturlexikon"

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: "((\"willy literaturlexikon\") OR (\"wills literaturlexikon\"))".
• Removing quotes may allow a broader search: (( willy literaturlexikon ) OR ( wills literaturlexikon )).
• Adding a wildcard symbol may retrieve word variants: (("willy literaturlexikon") OR ("wills literaturlexikon"))*.