Perhaps you should try some spelling variations:
person communication » personal communication, personal communications, irsn communication
technology energy » technology early, technology emerging, technology experts
4 developing » 3 developing
developing 2 » developing _, developing a, developing e
der person » per person, der personen, older persons
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 person communication costs 4 developing 2 areal.*.