Perhaps you should try some spelling variations:
income distributional » income distributions, income distribution1.3, more distributional
income redistribution » income distributions
2f developing » f developing, 2.3 developing, 2.2 developing
72 developing » 7.2 developing, 762 developing, 2 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 distribution)) %((2f developing) OR (72 developing)) countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((income distributional) or (income redistribution))) or (income distribution)) %((2f developing) OR (72 developing)) countries%22".
• Adding a wildcard symbol may retrieve word variants: %((((income distributional) or (income redistribution))) or (income distribution)) %((2f developing) OR (72 developing)) countries%22*.