Perhaps you should try some spelling variations:
3.7 communication » 3.2 communication, 2.7 communication, 3.5 communication
development law » development latin, development 1
technology gap » technology 1, technology 2.2, technology 3
20 development » 2 development, 2015 development, 2007 development
gap inflation » has inflation, grade inflation, rapid inflation
law afrique » l afrique
rate date » rate data, trade date, rate water
date 3.7 » daten 3.7, data 3.7, daten 3.3
costs 20 » costs 60, costs 2.3, costs 2.1

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• Adding a wildcard symbol may retrieve word variants: technology gap inflation rate date 3.7 communication costs 20 development law afrique.*.