Perhaps you should try some spelling variations:
2.3 communication » 3.2 communication, de communication, 4 communication
evaluation usage » evaluation stage, evaluation age, evaluation use
developpement de » developpement des, developpement durable
technology 2.1 » technology 2.2, technology 3.1, technology 1
2.1 evaluation » 4.1 evaluation, 2.3 evaluation, 5.1 evaluation
de afrique » de l'afrique, en afrique, l afrique
aware 2.3 » care 2.3, hardware 2.3

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

• Adding a wildcard symbol may retrieve word variants: technology 2.1 evaluation usage aware 2.3 communication costs _ developpement de afrique.*.