Perhaps you should try some spelling variations:
technologien aids » technologien als, technologien ad, technologien des
den communication » open communication, lean communication, when communication
aids information » chandos information, series information
15.3 developing » 1.3 developing, 10.3 developing, 5.3 developing
contents 3.1 » contents 1, contents _, contents map
costs 15.3 » costs 12.3, costs 14.3, costs 5.3
3.1 den » 3.1 der, 3.1 de, 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 den communication costs 15.3 developing _ africa.*.