Perhaps you should try some spelling variations:
2.3.1 communications » 2.3.1.1 communication, 2.3 communication, 3.1 communication
communications code » communication mode, communications case, communications models
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
inflation bonds » inflation boys, inflation und, inflation bias
technology use » technology 1, technology 2.2, technology 3
use inflation » push inflation, und inflation, die inflation
bonds prices » bond prices, bond price, goods prices
prices 2.3.1 » prices 2.3.4, prices 2.3.5, prices 2.3.6
code de » code des

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• Adding a wildcard symbol may retrieve word variants: technology use inflation bonds prices 2.3.1 communications code de developpement en afrique.*.