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