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