Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
rich populations » richer populations, reach populations, risk populations
developpement en » developpement et, developpement des, developpement de
technology rich » technology risk, technology africa, technology rights
a developpement » au developpement, de developpement, le developpement
prices 6.2 » prices 3.2, prices 4.2, prices 5.2
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 rich populations _ prices 6.2 communication costs a developpement en afrique.*.