Perhaps you should try some spelling variations:
3.4 communication » 5.4 communication, 3.2 communication, 3.5 communication
technologien fur » technologien des, technologien und, technologies 2
fur information » zur information, fair information, your information
developing 4 » developing _, developing a, developing e
4 areal » 4 real, _ areal, 2 areal
case a » case 1, case 2, case 4
case 3 » case 1, case 2

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 fur information ((case a) OR (case 3)) 3.4 communication costs _ developing 4 areal.~".
• Adding a wildcard symbol may retrieve word variants: technologien fur information ((case a) OR (case 3)) 3.4 communication costs _ developing 4 areal.*.