Perhaps you should try some spelling variations:
12.3 communication » 2.3 communication, 1.3 communication, 2.2.3 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
firm 12.3 » firm 1.1, 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 firm 12.3 communication costs de developpement la fabrique.*.