Perhaps you should try some spelling variations:
information kontext » information content, information contents, information centers
communication cost » communication costs, communication costa, communications costs
technologies 2.1 » technologies _, technologies 4, technologies a
de communication » mobile communication, online communication
2.1 information » 3.1 information
3.4 developing » 13.4 developing, 3.3 developing, 3.2 developing
developing ce » developing e, developing ict, developing cil
kontext das » kontext des, kontext der, kontext die
ce africa » de africa, care africa, use africa
cost 3.4 » cost 2.4, cost 3.2, cost 3.5
das de » das der, das dem, das den

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

• Adding a wildcard symbol may retrieve word variants: technologies 2.1 information kontext das de communication cost 3.4 developing ce africa.*.