Perhaps you should try some spelling variations:
4.1 communication » 4 communication, 2.3 communication, 3.2 communication
developpement en » developpement et, developpement des, developpement de
technology 2 » technology _, technology 1, technology 3
2 inflation » 12 inflation, _ inflation, 6 inflation
rate space » state space, trace space, safe space
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 2 inflation rate space 4.1 communication costs _ developpement en afrique.*.