Perhaps you should try some spelling variations:
"informationsmanager" » "informationsmangel", "informationsmanagement", "informationsmanagements"
"informationsempfanger" » "informationsmangel"
"innovationsmanager" » "innovationsmanagement", "innovationsmanagements"

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