Perhaps you should try some spelling variations:
2.7 communication » 2.3 communication, 3.2 communication, 2 communication
study population » student population, student populations, city population
population based » population age, simulation based, population data
developpement en » developpement et, developpement des, developpement de
4 developpement » de developpement, le developpement, et developpement
based france » based finance, based face, based frame
france 2.7 » france 2.2, france 2.1, france 2.3
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology study population based france 2.7 communication costs 4 developpement en afrique.*.