Perhaps you should try some spelling variations:
income distributions » income redistribution, time distributions, discrete distributions
turf developing » stuff developing, future developing, tariff developing
f developing » 7 developing, self developing, f development

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: %((income distributions) OR (income distribution)) %((f developing) OR (turf developing)) countries%22.
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