Perhaps you should try some spelling variations:
2.5 communication » 2.3 communication, 2.7 communication, 3.5 communication
developpement de » developpement des, developpement durable
4 developpement » de developpement, le developpement, et developpement
inflation fuel » inflation build, inflation und, inflation auf
prices 2.5 » prices 2.4, prices 2.1, prices 2.3
de afrique » de l'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 _ inflation fuel prices 2.5 communication costs 4 developpement de afrique.*.