Perhaps you should try some spelling variations:
"many diseases lehrbuch" » "many pilates lehrbuch", "many dieses lehrbuches", "human diseases lehrbuch"
"many divines lehrbuch" » "many kleines lehrbuch", "many pilates lehrbuch", "many des lehrbuch", "many divine lehrbuch", "many divorces lehrbuch", "many lines lehrbuch"
"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 deletes lehrbuch", "many diverse 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") OR ("many diseases lehrbuch"))) OR ("many divines lehrbuch")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"mir dieses lehrbuch\") or (((((\"many dieses lehrbuch\") OR (\"many diseases lehrbuch\"))) or (\"many divines lehrbuch\"))))".
• Removing quotes may allow a broader search: (( mir dieses lehrbuch ) or ((((( many dieses lehrbuch ) OR ( many diseases lehrbuch ))) or ( many divines lehrbuch )))).
• Adding a wildcard symbol may retrieve word variants: (("mir dieses lehrbuch") or ((((("many dieses lehrbuch") OR ("many diseases lehrbuch"))) or ("many divines lehrbuch"))))*.