Perhaps you should try some spelling variations:
22income distribution » income distribution, income redistribution, income distributional
income distributions » income distribution, income redistribution, time distributions
genome distribution » genomic distribution, gene distribution, monomer distribution
7.2 developing » 3.2 developing, 12 developing, 22 developing
762 developing » 12 developing, 22 developing, 3.2 developing
5.2 developing » 12 developing, 22 developing, 5.2 development
72 developing » 12 developing, 22 developing, 32 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 (income distributions)) %((((72 developing) OR (7.2 developing))) OR (((762 developing) OR (5.2 developing)))) countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22income distribution) or (genome distribution))) or (income distributions)) %((((72 developing) or (7.2 developing))) or (((762 developing) OR (5.2 developing)))) countries%22".
• Adding a wildcard symbol may retrieve word variants: %((((22income distribution) or (genome distribution))) or (income distributions)) %((((72 developing) or (7.2 developing))) or (((762 developing) OR (5.2 developing)))) countries%22*.