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