Perhaps you should try some spelling variations:
technologien secondary » technologien bedarf, technologies necessary
secondary information » security information
oral communication » personal communication
developing base » developing based, developing east, developing brain
information 4 » information 2
4 developing » 3 developing
base areas » basic areas, based areal, basin areas
debt oral » debt moral, debt oil
costs 4 » costs _, costs a, costs 4.2
4 debt » 3 debt, 4 debats

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

• Adding a wildcard symbol may retrieve word variants: technologien secondary information 4 debt oral communication costs 4 developing base areas.*.