Perhaps you should try some spelling variations:
3.4.2 communication » 3.3.2 communication, 3.4.1 communication, 3.4.4 communication
innovation states » innovation state, innovation spaces, innovation shades
developpement de » developpement des, developpement durable
technology gaps » technology gap
gaps innovation » als innovation, cars innovation, groups innovation
a developpement » au developpement, de developpement, le developpement
case 3.4.2 » case 1.4.2, case 3.1.2, case 3.3.2
de afrique » de l'afrique, en afrique, l afrique
costs a » costs _, costs 4

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• Adding a wildcard symbol may retrieve word variants: technology gaps innovation states case 3.4.2 communication costs a developpement de afrique.*.