Perhaps you should try some spelling variations:
income distributions » income redistribution, time distributions, discrete distributions
genome distribution » genomic distribution, gene distribution, monomer distribution
7.2 developing » 5.2 developing, 12 developing, 22 developing
72 developing » 762 developing, 12 developing, 22 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 distribution) OR (genome distribution))) OR (income distributions)) %((72 developing) OR (7.2 developing)) countries%22.
• Adding a wildcard symbol may retrieve word variants: %((((income distribution) or (genome distribution))) or (income distributions)) %((72 developing) or (7.2 developing)) countries%22*.