Perhaps you should try some spelling variations:
"mir dieses lehrbuch" » "mir kleines lehrbuch", "mir pilates lehrbuch", "sie dieses lehrbuch", "fur dieses lehrbuch", "wie dieses lehrbuch"
"many dieses lehrbuch" » "many kleines lehrbuch", "many pilates lehrbuch", "man dieses lehrbuch", "many diseases lehrbuch", "many divines lehrbuch"

Try widening your search to All Fields.

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: (("mir dieses lehrbuch") OR ("many dieses lehrbuch")).
• Removing quotes may allow a broader search: (( mir dieses lehrbuch ) or ( many dieses lehrbuch )).
• Adding a wildcard symbol may retrieve word variants: (("mir dieses lehrbuch") or ("many dieses lehrbuch"))*.