Perhaps you should try some spelling variations:
technology create » technology creates, technology rate, technologies create
create population » area population, oleae population, peace population
5.2 communication » 3.2 communication, 6.2 communication, 2.2 communication
4 developpement » de developpement, le developpement, et developpement
population per » population panel, population p230, population area
des afrique » en afrique, de l'afrique
per fig » per 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 create population per fig 5.2 communication costs 4 developpement des afrique.*.