Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
technologies key » technologies any, technologies know, technologies _
do communication » do communications, de communication, ngo communication
development goal » development goals
key information » energy information
goal africans » gap africans, agoa african, all africans
costly world » post world, lost world

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

• Adding a wildcard symbol may retrieve word variants: technologies key information 3.2 _ do communication costly world development goal africans.*.