Perhaps you should try some spelling variations:
5.5.4 communication » 5.5.2 communication, 3.4.4 communication, 4.2.4 communication
ecological gains » technological gains, ecological bank, ecological ruin
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

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