Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
adoption equation » advection equation, valuation equation, evolution equation
3 communications » 3 communication, 2 communications, 4 communications
developpement de » developpement des, developpement durable
a developpement » au developpement, de developpement, le developpement
equation taken » equation take, equation taking, equation based
taken place » market place
de afrique » de l'afrique, en afrique, l afrique
place 3 » place _, place a, place 2.3
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology adoption equation taken place 3 communications costs a developpement de afrique.*.