Perhaps you should try some spelling variations:
personal communication » interpersonal communication
technologies energy » technologies general, technology energy, technologies any
information 3 » information 2
der personal » der personalen, der personen, der person
4 developing » 3 developing
developing a » developing _
costs 4 » costs _, costs a, costs 4.2
a areas » 1 areas, 2 areas, 4 areas
3 der » _ der, 2 der

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

• Adding a wildcard symbol may retrieve word variants: technologies energy information 3 der personal communication costs 4 developing a areas.*.