Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
wave communications » face communications, data communications, faso communications
information ladder » information letter, information der, information labor
developing cpia » developing china, developing asia, developing cil
technologies 2 » technologies _, technologies 4
4.1 developing » 3.1 developing, 4 developing, 3.3 developing
costs 4.1 » costs 4.2, costs 4.4, costs 4.3
low wave » low wage, how wave, low wages

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information ladder low wave communications costs 4.1 developing cpia africa.*.