Perhaps you should try some spelling variations:
4.3 communication » 2.3 communication, 4.1 communication, 4 communication
developpement de » developpement des, developpement durable
technology low » technology flow, technology law, technology led
low inflation » core inflation, _ inflation
rate space » state space, trace space, safe space
de afrique » de l'afrique, en afrique, l afrique
space 4.3 » space 3.3, space 2.1, space 3.2

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

• Adding a wildcard symbol may retrieve word variants: technology low inflation rate space 4.3 communication costs _ developpement de afrique.*.