Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
technologien und » technologie und, technologien des, technologien fur
und informations » und information, und informationen, fund information
un communication » 3 communication, 4 communication, 1 communication
2.4 developing » 12.4 developing, 2.2 developing, 5.4 developing
a aes » _ aes, a abs
a aus » _ aus, a auf, i aus

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 und informations und die un communication cost 2.4 developing ((a aes) OR (a aus)).~".
• Adding a wildcard symbol may retrieve word variants: technologien und informations und die un communication cost 2.4 developing ((a aes) OR (a aus)).*.