Perhaps you should try some spelling variations:
6.2.4.2 communication » 6.2.4.1 communication, 6.2.4.3 communication, 3.2.3.2 communication
developpement de » developpement des, developpement durable
4 developpement » de developpement, le developpement, et developpement
prices 6.2.4.2 » prices 2.2.2, prices 2.2.5.7, prices 3.4.2
technology 2 » technology _, technology 1, technology 3
index prices » index price, index places, index provinces
2 inflation » 12 inflation, _ inflation, 6 inflation
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 2 inflation index prices 6.2.4.2 communication costs 4 developpement de afrique.*.