Perhaps you should try some spelling variations:
6.2.4.1 communication » 6.2.4.2 communication, 6.2.4.3 communication, 11.4.1 communication
de developpement » sme development
developpement de » developpement des, developpement durable
technology gaps » technology gap
gaps inflation » has inflation, grade inflation, rapid inflation
primer 6.2.4.1 » primer 2.3.1.1, primer a2.1.1, trimer 2.4.1
inflation a » inflation _, inflation tax, inflation rate
de afrique » de l'afrique, en afrique, l afrique
costs de » costs _, costs 4, costs a

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• Adding a wildcard symbol may retrieve word variants: technology gaps inflation a primer 6.2.4.1 communication costs de developpement de afrique.*.