Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
etf communications » data communications, cell communications, peru communications
formal context » formal contexts, formal concept, formats content
4 developing » 3 developing
developing a » developing _
from formal » from informal
context how » content how, context has, context he
a africa » 1 africa, can africa, em africa
how etf » how ecte
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 etf communications costs 4 developing a africa.*.