Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
technology volume » technologies volume, seismology volume, technology evolution
volume variation » volume evaluation, volume ventilation, volume estimation
2 communications » 2 communication, 3 communications, 4 communications
development lid » development led, development li, development lie
variation e » variation de, variation _, variation 6
lid afrique » l afrique
costs a » costs _, costs 4
e case » ce case, he case, re case
case 2 » case 1

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

• Adding a wildcard symbol may retrieve word variants: technology volume variation e case 2 communications costs a development lid afrique.*.