Perhaps you should try some spelling variations:
22income distribution » genome distribution, income distributional, income distributive
income distributions » time distributions, size distributions, stable distributions
self developing » relief developing, self development, level 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 redistribution))) OR (((((income distributions) OR (discrete distributions))) OR (income distribution)))) %((self developing) OR (70 developing)) countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22income distribution) OR (income redistribution))) or (((((income distributions) or (discrete distributions))) or (income distribution)))) %((self developing) or (70 developing)) countries%22".
• Adding a wildcard symbol may retrieve word variants: %((((22income distribution) OR (income redistribution))) or (((((income distributions) or (discrete distributions))) or (income distribution)))) %((self developing) or (70 developing)) countries%22*.