Perhaps you should try some spelling variations:
income distributional » income distribution1.3, income redistribution, more distributional
income distributions » income redistribution, time distributions, discrete distributions
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: %((income distributional) OR (((income distributions) OR (income distribution)))) %((relief developing) OR (70 developing)) countries%22.
• Adding a wildcard symbol may retrieve word variants: %((income distributional) or (((income distributions) or (income distribution)))) %((relief developing) or (70 developing)) countries%22*.