Perhaps you should try some spelling variations:
15.3 communication » 1.3 communication, 8.5.3 communication, 2.3 communication
technologien des » technologien fur, technologien und, technologies 2
des information » des informations, does information, dis information
developing east » development east, developing a, developing asia
information 2 » information 3
a developing » a development
state 15.3 » stage 15.3, state 15.1, state 1.5.1
east areas » karst areas, east asezs
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technologien des information 2 state 15.3 communication costs a developing east areas.*.