Perhaps you should try some spelling variations:
"informationsmanager" » "informationsmangel", "innovationsmanager", "informationsmanagement"
"informationsempfanger" » "informationsmangel"
"informationsmittel" » "informationsmodell", "informationsmaterial"

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: ("informationsmanager" OR (("informationsempfanger" OR "informationstrager") OR "informationsmittel")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(\"informationsmanager\" or ((\"informationsempfanger\" OR \"informationstrager\") or \"informationsmittel\"))".
• Removing quotes may allow a broader search: ( informationsmanager or (( informationsempfanger OR informationstrager ) or informationsmittel )).
• Adding a wildcard symbol may retrieve word variants: ("informationsmanager" or (("informationsempfanger" OR "informationstrager") or "informationsmittel"))*.