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