Perhaps you should try some spelling variations:
7.6.2 communication » 3.3.2 communication, 3.4.2 communication, 4.2.2 communication
methodology higher » methodology history, methodology hayek, methodology insights
higher inflation » high inflation, higher education
developpement de » developpement des, developpement durable
a developpement » au developpement, de developpement, le developpement
inflation a » inflation _, inflation tax, inflation rate
part 7.6.2 » part 2.2.2, part 2.3.2, part 6.2
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: methodology higher inflation a part 7.6.2 communication costs a developpement de afrique.*.