Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
informations centers » information centers, information center, information centre
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
technologien des » technologien fur, technologien und, technologies 2
des informations » aids information
11.7 developing » 11.5 developing, 12.7 developing, 11.7.4 developing
costs 11.7 » costs 11.1, costs 11.4, costs 1.1.3
centers 3 » centers _, centers a, centers 3.3
3 3.1 » _ 3.1, i 3.1, a 3.1

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

• Adding a wildcard symbol may retrieve word variants: technologien des informations centers 3 3.1 communications costs 11.7 developing _ africa.*.