Perhaps you should try some spelling variations:
personen communication » personal communication, personal communications, prone communication
information costs » information contents, information centers, information content
developing cpia » developing china, developing asia, developing cil
technologies 2 » technologies _, technologies 4
der personen » der personalen, per person, und personen
costs der » costs differ

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technologies 2 information costs der personen communication costs _ developing cpia africa.*.