Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
population based » population age, simulation based, population data
le developpement » de developpement, sme development
developpement en » developpement et, developpement des, developpement de
technology city » technology ecit, technology china, technology costs
based ict » based ilc, based imo, used ict
costs le » costs _, costs 4, costs a

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

• Adding a wildcard symbol may retrieve word variants: technology city population based ict 6.2 communication costs le developpement en afrique.*.