Perhaps you should try some spelling variations:
22income distribution » income distribution, income redistribution, income distributional
monomer distribution » money distribution, isomer distribution, polymer distribution
income distributions » income distribution, income redistribution, time distributions
genome distribution » genomic distribution, gene distribution, income distribution
762 developing » 7.2 developing, 2 developing, 22 developing
72 developing » 7.2 developing, 2 developing, 22 developing
12 developing » 2 developing, 12 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 (monomer distribution))))) OR (income distributions)) %((72 developing) OR (((762 developing) OR (12 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 (income distributions)) %((72 developing) or (((762 developing) OR (12 developing)))) countries%22".
• Adding a wildcard symbol may retrieve word variants: %((((22income distribution) or (((genome distribution) or (monomer distribution))))) or (income distributions)) %((72 developing) or (((762 developing) OR (12 developing)))) countries%22*.