Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
technologien des » technologien fur, technologien und, technologies 2
des informations » aids information
un communication » 3 communication, 4 communication, 1 communication
2.5 developing » 25.5 developing, 2.2 developing, 1.5 developing
cost 2.5 » costs 2.5, cost 2.4, cost 2.2
a aes » _ aes, a abs
a aus » _ aus, a auf, i aus
und » fund

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "technologien des informations und die un communication cost 2.5 developing ((a aes) OR (a aus)).~".
• Adding a wildcard symbol may retrieve word variants: technologien des informations und die un communication cost 2.5 developing ((a aes) OR (a aus)).*.