Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
technologien fur » technologien des, technologien und, technologies 2
et communication » et communicatione, get communication, debt communication
fur information » zur information, fair information, your information
developing use » developing e, developing ce, developing csi
15 developing » 1 developing, 5 developing, 10 developing
contents 2.5 » contents 2.1, contents 2.3, contents 5.2.5
cost 15 » cost 12, cost 5, cost 11.5
2.5 et » 2.5 ext4

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

• Adding a wildcard symbol may retrieve word variants: technologien fur information contents 2.5 et communication cost 15 developing use africa.*.