Perhaps you should try some spelling variations:
persona communication » personal communication, personal communications, personal communicator
technologien aids » technologien als, technologien ad, technologien des
aids information » chandos information, series information
information 2.5 » information 2.2, information 2.7, information 2.0
4.2 developing » 2.2 developing, 3.2 developing, 4.1 developing
de persona » de personal, de personas, die persona
2.5 de » 2.5 die, 2.5 der, 2.5 dve

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

• Adding a wildcard symbol may retrieve word variants: technologien aids information 2.5 de persona communication costs 4.2 developing _ areas.*.