Perhaps you should try some spelling variations:
technologien bedarf » technologien auf
bedarf information » secondary information
oral communication » personal communication
information 2.1.7 » information 2.1.5, information 2.1.6, information 2.2.7
developing asia » development asia, developing a
a developing » a development
2.1.7 heat » 2.2.4 heat, 2.2.6 heat, 2.3.2 heat
asia areas » basic areas, aside areas, basin areas
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 bedarf information 2.1.7 heat oral communication costs a developing asia areas.*.