Perhaps you should try some spelling variations:
income redistribution » income distribution
income distributions » income distribution, time distributions, size distributions
genome distribution » genomic distribution, gene distribution, monomer distribution
2.2 developing » 12.2 developing, 22 developing, 5.2 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: %((((income redistribution) OR (genome distribution))) OR (((income distributions) OR (discrete distributions)))) %2.2 developing countries%22.
• Adding a wildcard symbol may retrieve word variants: %((((income redistribution) or (genome distribution))) or (((income distributions) or (discrete distributions)))) %2.2 developing countries%22*.