Perhaps you should try some spelling variations:
22income distribution » income distribution, income redistribution, genome distribution
income distributions » income distribution, income redistribution, time distributions
70 developing » 10 developing, 20 developing, 30 developing
f development » leaf development, chef development, reef development

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• If you are trying to use Boolean operators, they must be ALL CAPS: %((22income distribution) OR (income distributions)) %((((70 developing) OR (self development))) OR (f development)) countries%22.
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