Perhaps you should try some spelling variations:
positive communication » positive communications, proactive communication, passive communication
developpement de » developpement des, developpement durable
method overview » methods overview
4 developpement » de developpement, le developpement, et developpement
has positive » have positive, hiv positive, a positive
de afrique » de l'afrique, en afrique, l afrique
social 4 » social _, social a
costs 4 » costs _, costs a, costs 4.2
4 has » 4 das, _ has, 1 has

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

• Adding a wildcard symbol may retrieve word variants: method overview social 4 has positive communication costs 4 developpement de afrique.*.