Perhaps you should try some spelling variations:
2.2 communication » 2.3 communication, 3.2 communication, 2.7 communication
developpement en » developpement et, developpement des, developpement de
a developpement » au developpement, de developpement, le developpement
3 information » 1 information
systems trade » systems trace, systems nitrate, systems trends
technology 3 » technology _, technology 1, technology 4
trade 2.2 » trade 3.2, trade 4.1
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology 3 information systems trade 2.2 communication costs a developpement en afrique.*.