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

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