Perhaps you should try some spelling variations:
1.2.4 communication » 12.2.4 communication, 10.2.4 communication, 4.2.4 communication
technology change » technological change, technological changes
change inflation » change information, change innovation, change simulation
developpement en » developpement et, developpement des, developpement de
inflation rates » inflation rate
have 1.2.4 » have 9.2.2, have 9.6.4

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• Adding a wildcard symbol may retrieve word variants: technology change inflation rates have 1.2.4 communication costs _ developpement en afrique.*.