Perhaps you should try some spelling variations:
22income distribution » income distributions, genome distribution, income distributional
income redistribution » income distributions
2f developing » f developing, 7 developing, self developing
70 developing » 10 developing, 20 developing, 30 developing

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: %((((22income distribution) OR (income redistribution))) OR (income distribution)) %((2f developing) OR (70 developing)) countries%22.
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• Adding a wildcard symbol may retrieve word variants: %((((22income distribution) OR (income redistribution))) or (income distribution)) %((2f developing) or (70 developing)) countries%22*.