Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
arab communications » arabia communications, rural communications, qatar communications
information costs » information contents, information centers, information content
developing cpia » developing china, developing asia, developing cil
4 developing » 3 developing
how arab » how arabic, how areas, new arab
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: technological _ information costs how arab communications costs 4 developing cpia africa.*.