Perhaps you should try some spelling variations:
income distributional » income distribution1.3, more distributional, income distributive
income distributions » time distributions, discrete distributions, size distributions
2f developing » f developing, 70 developing, 72 developing

Try widening your search to All Fields.

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 redistribution) OR (income distributions))) OR (income distribution)))) %2f developing countries%22.
• Adding a wildcard symbol may retrieve word variants: %((income distributional) or (((((income redistribution) or (income distributions))) or (income distribution)))) %2f developing countries%22*.