Perhaps you should try some spelling variations:
leur developpement » le developpement, deux developpements, de developpement
innovation surveys » innovation series, innovation systems
technology trade » technology trends, technology transfer, technology transfers
trade innovation » trade information, drive innovation, trade integration
4 communication » 3 communication, 5.4 communication, de communication
developpement l » developpement il, developpement la, developpement de
surveys since » survey since, surveys income, surveys france
l afrique » en afrique
since 4 » since _, since c, science 4

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

• Adding a wildcard symbol may retrieve word variants: technology trade innovation surveys since 4 communication a leur developpement l afrique.*.