Perhaps you should try some spelling variations:
income redistribution » income distribution
income distributions » income distribution, time distributions, discrete distributions
7.2 developing » 5.2 developing, 3.2 developing, 12 developing
f developing » self developing, turf developing, 2.1 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 redistribution) OR (income distributions)) %((((2((f developing) OR (7.2 developing))) OR (sel((f developing) OR (7.2 developing))))) OR (((f developing) OR (7.2 developing)))) countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((income redistribution) or (income distributions)) %((((2((f developing) OR (7.2 developing))) or (sel((f developing) OR (7.2 developing))))) or (((f developing) OR (7.2 developing)))) countries%22".
• Adding a wildcard symbol may retrieve word variants: %((income redistribution) or (income distributions)) %((((2((f developing) OR (7.2 developing))) or (sel((f developing) OR (7.2 developing))))) or (((f developing) OR (7.2 developing)))) countries%22*.