Perhaps you should try some spelling variations:
personal communication » interpersonal communication
technologies series » technology series
series information » business information
information 2.7 » information 2.2, information 3.2, information 1.2
der personal » der personalen, der personen, der person
4 developing » 3 developing
developing a » developing _
2.7 der » 3.7 der, 5.7 der, 1.7 der
costs 4 » costs _, costs a, costs 4.2
a areal » _ areal, 2 areal, 4 areal

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

• Adding a wildcard symbol may retrieve word variants: technologies series information 2.7 der personal communication costs 4 developing a areal.*.