Perhaps you should try some spelling variations:
persona communication » personal communication, personal communications, personal communicator
information 3.3.1 » information 3.3.3, information 5.3.1, information 2.3.1
technologies 2 » technologies _, technologies 4
developing 4 » developing _, developing a, developing e
ein persona » eine person, die persona, non personal
3.3.1 ein » 3.3.1 eine, 3.3.4 ein, 3.1.1 ein
4 areal » 4 real, _ areal, 2 areal

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information 3.3.1 ein persona communication costs _ developing 4 areal.*.