Perhaps you should try some spelling variations:
personal communication » interpersonal communication
information centre » information centers, information contents
technologies 2 » technologies _, technologies 4
der personal » der personalen, der personen, der person
4 developing » 3 developing
centre der » centre de, centre des, centres de
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information centre der personal communication costs 4 developing _ africa.*.