Perhaps you should try some spelling variations:
developpement durable » developpement de
communication paper » communication power, communication pattern, communication partner
3.2 communication » 3 communication, 2.3 communication, de communication
3.1 developpement » 3.1 development, de developpement, le developpement
rate space » state space, trace space, safe space
space 3.2 » space 2.1
paper 3.1 » paper 23.2, papers 3.3, paper 1

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

• Adding a wildcard symbol may retrieve word variants: technology _ inflation rate space 3.2 communication paper 3.1 developpement durable afrique.*.