Perhaps you should try some spelling variations:
personal communication » interpersonal communication
technology energy » technology early, technology emerging, technology experts
der personal » der personalen, der personen, der person
4 developing » 3 developing
developing 2 » developing _, developing a, developing e
costs 4 » costs _, costs a, costs 4.2
2 areal » 2 real, _ areal, 2 areas

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

• Adding a wildcard symbol may retrieve word variants: technology energy information _ der personal communication costs 4 developing 2 areal.*.