Perhaps you should try some spelling variations:
4.1 communication » 4 communication, 2.3 communication, 3.2 communication
developpement de » developpement des, developpement durable
technology rate » technology state, technology role, technology related
rate inflation » grade inflation, wage inflation, age inflation
rate space » state space, trace space, safe space
de afrique » de l'afrique, en afrique, l afrique
space 4.1 » space 2.1, space 4.3, space 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology rate inflation rate space 4.1 communication costs _ developpement de afrique.*.