Perhaps you should try some spelling variations:
22income distribution » income redistribution, genome distribution, income distributional
income distributions » income redistribution, size distributions, stable distributions
time distributions » time distribution, size distributions, stable distributions
2f developing » f developing, 2.1 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: %((((22income distribution) OR (((((income distributions) OR (discrete distributions))) OR (income distribution))))) OR (time distributions)) %2f developing countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22income distribution) or (((((income distributions) OR (discrete distributions))) or (income distribution))))) or (time distributions)) %2f developing countries%22".
• Adding a wildcard symbol may retrieve word variants: %((((22income distribution) or (((((income distributions) OR (discrete distributions))) or (income distribution))))) or (time distributions)) %2f developing countries%22*.