Perhaps you should try some spelling variations:
6.1 communication » 4.1 communication, 1.1 communication, 3.1 communication
study population » student population, student populations, city population
population marie » population matrix, population marriage, population series
developpement la » developpement de, developpement et, developpement du
4 developpement » de developpement, le developpement, et developpement
marie france » paris france, markets france, marie ange
france 6.1 » france 1
la afrique » l afrique, la fabrique, en afrique
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 marie france 6.1 communication costs 4 developpement la afrique.*.