Perhaps you should try some spelling variations:
22income distribution » income distribution, income redistribution, income distributive
income distributional » income distribution, income distribution1.3, income redistribution
income distributions » income distribution, income redistribution, discrete distributions
genome distribution » genomic distribution, gene distribution, monomer distribution
time distributions » time distribution, size distributions, stable distributions
2f developing » f developing, 7 developing, self developing
70 developing » 10 developing, 20 developing, 30 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 (income distributional))) OR (genome distribution))) OR (((income distributions) OR (time distributions)))) %((2f developing) OR (70 developing)) countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((((22income distribution) or (income distributional))) or (genome distribution))) or (((income distributions) OR (time distributions)))) %((2f developing) or (70 developing)) countries%22".
• Adding a wildcard symbol may retrieve word variants: %((((((22income distribution) or (income distributional))) or (genome distribution))) or (((income distributions) OR (time distributions)))) %((2f developing) or (70 developing)) countries%22*.