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 he » context has, context how, context 3
he face » we face, head face, when face
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 he face communication costs 4 developing _ africa.*.