Perhaps you should try some spelling variations:
"informationsmanager" » "innovationsmanager", "informationstrager", "informationsmanagement"
"informationsmangel" » "informationsempfanger", "informationsangebot", "informationsmedien"
"informationsmodell" » "informationsquelle"
"informationsmittel" » "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 (("informationsmangel" OR "informationsmodell") OR "informationsmittel")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(\"informationsmanager\" or ((\"informationsmangel\" OR \"informationsmodell\") or \"informationsmittel\"))".
• Removing quotes may allow a broader search: ( informationsmanager or (( informationsmangel OR informationsmodell ) or informationsmittel )).
• Adding a wildcard symbol may retrieve word variants: ("informationsmanager" or (("informationsmangel" OR "informationsmodell") or "informationsmittel"))*.