Perhaps you should try some spelling variations:
information centers » information contents, information officers
debt communication » de communication, et communication, get communication
communication cost » communication costs, communication costa, communications costs
technologien des » technologien fur, technologien und, technologies 2
des information » des informations, does information, dis information
developing city » developing cities, developing data, developing high
5.4 developing » 6.4 developing, 3.3 developing, 2.2 developing
centers 1.3 » centers 3.3, centers 4.3, centers 12.4
city africa » china africa, cults africa
1.3 debt » 2.3 debt, 10.8 debt, 1.3 der
cost 5.4 » costs 5.4, cost 2.4, cost 3.4

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

• Adding a wildcard symbol may retrieve word variants: technologien des information centers 1.3 debt communication cost 5.4 developing city africa.*.