Perhaps you should try some spelling variations:
22income distribution » income redistribution, income distributional, income distributive
income distributions » income redistribution, time distributions, discrete distributions
genome distribution » genomic distribution, gene distribution, monomer distribution
70 developing » 10 developing, 30 developing, 40 developing
20 developing » 10 developing, 20 development

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %((((((22income distribution) OR (genome distribution))) OR (income distribution))) OR (income distributions)) %((70 developing) OR (20 developing)) countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((((22income distribution) or (genome distribution))) or (income distribution))) or (income distributions)) %((70 developing) OR (20 developing)) countries%22".
• Adding a wildcard symbol may retrieve word variants: %((((((22income distribution) or (genome distribution))) or (income distribution))) or (income distributions)) %((70 developing) OR (20 developing)) countries%22*.