Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
technologien does » technologien des, technologien als, technologie de
does information » des informations, dis information, users information
de communication » mobile communication, online communication
13.2 developing » 3.2 developing, 1.2 developing, 12.2 developing
contents 3.1 » contents 1, contents _, contents map
developing e » developing _, developing a, developing east
cost 13.2 » cost 3.2, cost 1.2, cost 11.3
e africa » em africa, de africa, eu africa
3.1 de » 3.1 die, 3.1 der, 3.1 def

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

• Adding a wildcard symbol may retrieve word variants: technologien does information contents 3.1 de communication cost 13.2 developing e africa.*.