Perhaps you should try some spelling variations:
2.3.5 communication » 2.3 communication, 2.2.3 communication, 2.5 communication
technology tools » technology thesis
tools population » ties population, does population, ios population
developpement et » developpement des, developpement de, development east
4 developpement » de developpement, le developpement, et developpement
population per » population panel, population p230, population area
firm 2.3.5 » fem 2.3.5
et afrique » en afrique, l afrique
per firm » per form, pr firm, payer firm
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 tools population per firm 2.3.5 communication costs 4 developpement et afrique.*.