Perhaps you should try some spelling variations:
2.3 communication » 3.2 communication, de communication, 4 communication
population panel » population age, population based, population area
de developpement » sme development
developpement la » developpement de, developpement et, developpement du
technology ties » technology tieups, technology studies, technology thesis
ties population » u.s population, les populations, nations population
panel firma » panel firm
firma 2.3 » firma 2.1, firm 12.3, firm 2.2
costs de » costs _, costs 4, costs a
fabrique. » afrique., fabrice.

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

• Adding a wildcard symbol may retrieve word variants: technology ties population panel firma 2.3 communication costs de developpement la fabrique.*.