Perhaps you should try some spelling variations:
springer andreas » sprenger andreas, saxinger andreas, strebinger andreas
singer andreas » saxinger andreas, binder andreas, langer andreas
springer index » singer index, primer index, springer und

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: ((((springer andreas) OR (singer andreas))) OR (springer index)) series.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((springer andreas) OR (singer andreas))) or (springer index)) series".
• Adding a wildcard symbol may retrieve word variants: ((((springer andreas) OR (singer andreas))) or (springer index)) series*.