Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
technologien aids » technologien als, technologien ad, technologien des
aids information » chandos information, series information
de communication » mobile communication, online communication
developing can » developing a, developing ai, developing av
13 developing » 1.3 developing, 3 developing, 1 developing
contents 3.1 » contents 1, contents _, contents map
can africa » urban africa
cost 13 » cost 12, cost 15, cost e3
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 aids information contents 3.1 de communication cost 13 developing can africa.*.