Perhaps you should try some spelling variations:
cost optimization » code optimization, cpt optimization, robust optimization
de developpement » sme development
developpement de » developpement des, developpement durable
technology cost » technology case, technology can, technology choice
3 communication » 4 communication, de communication, data communication
based have » based phase, based naive, based hiv
de afrique » de l'afrique, en afrique, l afrique
costs de » costs _, costs 4, costs a
have 3 » have _, have a, have 5.3

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

• Adding a wildcard symbol may retrieve word variants: technology cost optimization based have 3 communication costs de developpement de afrique.*.