Perhaps you should try some spelling variations:
2.3 communication » 3.2 communication, de communication, 4 communication
transfer factors » transfer factor, transfer across, transfer functions
developpement de » developpement des, developpement durable
factors case » factors cause, factor case, factors age
de afrique » de l'afrique, en afrique, l afrique
case case » base case, case based, use case
case 2.3 » case 3, case 4.1, case 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology transfer factors case case 2.3 communication efforts _ developpement de afrique.*.