Perhaps you should try some spelling variations:
persona communication » personal communication, personal communications, personal communicator
communication cost » communication costs, communication costa, communications costs
technologien des » technologien fur, technologien und, technologies 2
des informations » aids information
informations 2.5 » information 2.5.3, information 2.5.4, information 4.2.5
3.3 developing » 4 developing, 2 developing, 1 developing
debt persona » de persona, die persona, ein persona
2.5 debt » 2.5 der, 2.5 deep
cost 3.3 » cost 3.2, cost 2.3, cost 3.4

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

• Adding a wildcard symbol may retrieve word variants: technologien des informations 2.5 debt persona communication cost 3.3 developing _ areas.*.