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