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