Perhaps you should try some spelling variations:
personal communication » interpersonal communication
informations 15.2 » information 15.2, information 1.5.2, information 11.5.2
ein personal » ein persona, non personal, e personal
4 developing » 3 developing
developing 4 » developing _, developing a, developing e
15.2 ein » 1.5.2 ein, 1.2 ein, 5.2 ein
costs 4 » costs _, costs a, costs 4.2
4 areas » 1 areas, 2 areas, 4 areal

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

• Adding a wildcard symbol may retrieve word variants: technologien _ informations 15.2 ein personal communication costs 4 developing 4 areas.*.