Perhaps you should try some spelling variations:
22income distribution » income distribution, income distributions, income distributive
income distributional » income distribution, income distributions, income distribution1.3
income redistribution » income distribution, income distributions
development countries » developing countries, developed countries, development course
genome distribution » genomic distribution, gene distribution, monomer distribution
development country » developing country, development control, developed country

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