Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
technology evolution » technology solutions, technology adoption, technology education
evolution equation » evolution equations, convolution equation, valuation equation
2 communications » 2 communication, 3 communications, 4 communications
a developpement » au developpement, de developpement, le developpement
developpement l » developpement il, developpement la, developpement de
equation 18.1 » equation 14.1, equation 4.8.1, equations 10.1
18.1 rate » 16.1 rate
l afrique » en afrique
costs a » costs _, costs 4
rate 2 » rate _, rate 4, rate a

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• Adding a wildcard symbol may retrieve word variants: technology evolution equation 18.1 rate 2 communications costs a developpement l afrique.*.