Perhaps you should try some spelling variations:
technological gains » technological gaps, technological basis, ecological gains
5.5.4 communication » 5.5.2 communication, 3.4.4 communication, 4.2.4 communication
gains innovation » chains innovation, chains innovations, basics innovation
au developpement » du developpement, de developpement, le developpement
developpement en » developpement et, developpement des, developpement de
innovation rate » innovation race, innovation create, innovation state
costs au » costs a, costs amy, costs _
c 5.5.4 » c 5.5.2
rate c » rate co, rate _, rate 4

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

• Adding a wildcard symbol may retrieve word variants: technological gains innovation rate c 5.5.4 communication costs au developpement en afrique.*.