Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
technologien des » technologien fur, technologien und, technologies 2
des information » des informations, does information, dis information
2.4 developing » 12.4 developing, 2.2 developing, 5.4 developing
contents 3.3 » contents 3.1, content 3.3, contexts 3.3
costs 2.4 » costs 12.4, costs 23.4, cost 2.4
3.3 data » 2.3 data

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

• Adding a wildcard symbol may retrieve word variants: technologien des information contents 3.3 data communications costs 2.4 developing _ africa.*.