Perhaps you should try some spelling variations:
face communication » voice communication, de communication, time communication
formal context » formal contexts, formal concept, formats content
4 developing » 3 developing
from formal » from informal
context how » content how, context has, context he
how face » how race, how space, how false
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: technology from formal context how face communication costs 4 developing _ africa.*.