Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
technologien series » technologies series, technology series, technologies varies
information centers » information contents, information officers
series information » business information
de communications » de communication, do communications, mce communications
3.3 developing » 4 developing, 2 developing, 1 developing
developing 1 » developing _, developing a, developing e
centers 3.1 » center 3.1, centers 3.3, centers 3.8
costs 3.3 » costs 2.3, costs 3.5, costs 4.3
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 series information centers 3.1 de communications costs 3.3 developing 1 africa.*.