Perhaps you should try some spelling variations:
5.2 communication » 3.2 communication, 6.2 communication, 2.2 communication
technology tract » technology trade, technology act, technology trap
infections ratio » infection ratio, infection rates, infection rate
de developpement » sme development
ratio process » creation process, aeration process, ano process
process 5.2 » process 2.2, process 5.1, process 2.1
des afrique » en afrique, de l'afrique

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technology tract infections ratio process 5.2 communication _ de developpement des afrique.*.