Perhaps you should try some spelling variations:
3.2 communication » 3 communication, 2.3 communication, de communication
variation across » variations across, education across, variation series
developpement et » developpement des, developpement de, development east
4 developpement » de developpement, le developpement, et developpement
across crises » across classes
crises 3.2 » crisis 3.2, crises 2.2, crises 3.1
et afrique » en afrique, l afrique
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 _ variation across crises 3.2 communication costs 4 developpement et afrique.*.