Perhaps you should try some spelling variations:
face communication » voice communication, de communication, time communication
information costs » information contents, information centers, information content
technologies 2.1 » technologies _, technologies 4, technologies a
2.1 information » 3.1 information
costs differ » counts differ, cbdcs differ, sets differ
4 developing » 3 developing
developing 4 » developing _, developing a, developing e
differ face » differ price
4 access » 2 access, 3 access
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologies 2.1 information costs differ face communication costs 4 developing 4 access.*.