Perhaps you should try some spelling variations:
22income distribution » income redistribution, income distributional, income distributive
monomer distribution » money distribution, polymer distribution, power distribution
income distributions » income redistribution, time distributions, discrete distributions
genome distribution » genomic distribution, gene distribution, some distribution
isomer distribution » some distribution, power distribution, fisher distribution
72 developing » 7.2 developing, 762 developing, 2 developing

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 (((monomer distribution) OR (isomer distribution))))))) OR (((income distributions) OR (income distribution)))) %72 developing countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22income distribution) or (((genome distribution) or (((monomer distribution) or (isomer distribution))))))) or (((income distributions) OR (income distribution)))) %72 developing countries%22".
• Adding a wildcard symbol may retrieve word variants: %((((22income distribution) or (((genome distribution) or (((monomer distribution) or (isomer distribution))))))) or (((income distributions) OR (income distribution)))) %72 developing countries%22*.