Perhaps you should try some spelling variations:
study populations » study population, student populations, student population
populations based » population based, operations based, population case
3.3 communication » 2.3 communication, 3.2 communication, 3.5 communication
4 developpement » de developpement, le developpement, et developpement
developpement l » developpement il, developpement la, developpement de
based frame » based free, based face, based facade
frame 3.3 » frame 1.3, frame 3.4, frame 3.3.2
l afrique » 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 populations based frame 3.3 communication costs 4 developpement l afrique.*.