Perhaps you should try some spelling variations:
developing concepts » development concepts, development concept, developing countries
face communication » voice communication, de communication, time communication
concepts assessed » contexts assessed
technologies 2 » technologies _, technologies 4
information 1 » information 2, information 3, information 3.2
3 developing » 3 development
vf face » von face
costs 3 » costs _, costs 4, costs a
1 vf » 1 f, 1 sf, 1 v2

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information 1 vf face communication costs 3 developing concepts assessed.*.