Perhaps you should try some spelling variations:
technologien series » technologies series, technology series, technologies varies
information content » information contents, information centers, information centre
series information » business information
face communication » voice communication, de communication, time communication
4 developing » 3 developing
content 4.1 » contents 4.1, context 4.1, content 4.2
4.1 face » 5.1 face, 8.1 face, 4.2.1 face
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologien series information content 4.1 face communication costs 4 developing _ africa.*.