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

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