Perhaps you should try some spelling variations:
2.3 communication » 3.2 communication, de communication, 4 communication
variation across » variations across, education across, variation series
developpement en » developpement et, developpement des, developpement de
4 developpement » de developpement, le developpement, et developpement
across crimes » across crises, across regimes, across time
crimes 2.3 » crimes 1.3, crimes 2.10, crimes 3
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 crimes 2.3 communication costs 4 developpement en afrique.*.