Perhaps you should try some spelling variations:
22income distribution » income redistribution, genome distribution, income distributional
income distributions » income redistribution, time distributions, discrete distributions
turf developing » stuff developing, future developing, tariff developing
7.2 developing » 5.2 developing, 3.2 developing, 12 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)) %((7.2 developing) OR (turf developing)) countries%22.
• Adding a wildcard symbol may retrieve word variants: %((((22income distribution) or (income distribution))) or (income distributions)) %((7.2 developing) or (turf developing)) countries%22*.