Perhaps you should try some spelling variations:
22income distribution » income distribution, income distributional, income distributive
income redistribution » income distribution
development countries » developing countries, developed countries, development country
income distributions » income distribution, time distributions, discrete distributions
genome distribution » genomic distribution, gene distribution, monomer distribution

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 distributions))) OR (genome distribution))) OR (income redistribution)) %2 development countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((((22income distribution) OR (income distributions))) or (genome distribution))) or (income redistribution)) %2 development countries%22".
• Adding a wildcard symbol may retrieve word variants: %((((((22income distribution) OR (income distributions))) or (genome distribution))) or (income redistribution)) %2 development countries%22*.