Perhaps you should try some spelling variations:
oral communication » personal communication
transformation 13 » transformation 1.3, transformations 13, transformation 1
technologien die » technologie die, technologien des, technologien im
4 developing » 3 developing
wages oral » wages rural, wages social
13 wages » 1 wages, 15 wages, 3 wages
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologien die transformation 13 wages oral communication costs 4 developing _ areas.*.