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
technology 2.3 » technology 2.2, technology 2.1, technology 3.3
2.3 inflation » 2.3.1 inflation, 5.33 inflation, 2 inflation
price 6.2.4.2 » price 6.3.2
index price » index place, index choice, index places
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 2.3 inflation index price 6.2.4.2 communication costs 4 developpement de afrique.*.