Perhaps you should try some spelling variations:
"informationsmangel" » "informationsmanager", "informationsmittel", "informationsempfanger"
"innovationsmanager" » "innovationsmanagement", "innovationsmanagements"
"informationsmaterial" » "installationsmaterial", "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: (("informationsmangel" OR "innovationsmanager") OR "informationsmaterial").
• Removing quotes may allow a broader search: (( informationsmangel or innovationsmanager ) or informationsmaterial ).
• Adding a wildcard symbol may retrieve word variants: (("informationsmangel" or "innovationsmanager") or "informationsmaterial")*.