Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
inflation crane » inflation rate, inflation can, inflation crises
technology gap » technology 1, technology 2.2, technology 3
gap inflation » has inflation, grade inflation, rapid inflation
crane species » rare species, trace species, trans species
species 6.2 » species 1.2, species 2.2, species 6.4
costs de » costs _, costs 4, costs a

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• Adding a wildcard symbol may retrieve word variants: technology gap inflation crane species 6.2 communication costs de developpement en afrique.*.