Perhaps you should try some spelling variations:
personal communications » personal communication, interpersonal communications, internal communications
communications costs » communication costs, communications _
information costs » information contents, information centers, information content
developing china » developing china's, development china, developing caring
technologies 2 » technologies _, technologies 4
der personal » der personalen, der personen, der person
4 developing » 3 developing
costs der » costs differ
costs 4 » costs _, costs a, costs 4.2
asean. » asian.

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 personal communications costs 4 developing china asean.*.