Perhaps you should try some spelling variations:
personal communication » interpersonal communication
information centers » information contents, information officers
communication cost » communication costs, communication costa, communications costs
technologies 2 » technologies _, technologies 4
5.4 developing » 6.4 developing, 3.3 developing, 2.2 developing
developing a » developing _
cost 5.4 » costs 5.4, cost 2.4, cost 3.4
a africa » 1 africa, can africa, em africa

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information centers _ personal communication cost 5.4 developing a africa.*.