Perhaps you should try some spelling variations:
oral communication » personal communication
information costs » information contents, information centers, information content
technologien als » technologien des, technologien fur, technologien und
developing areas » developing asia, developing east, developing a
als information » als informations, aids information, laws information
areas areas » areas arenas, seas areas, areas access
4.2 oral » 4.5 oral, 4.1.2 oral, 14.4 oral

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

• Adding a wildcard symbol may retrieve word variants: technologien als information costs 4.2 oral communication costs _ developing areas areas.*.