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

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