Perhaps you should try some spelling variations:
22income distribution » income distribution, income distributions, income distributional
income redistribution » income distribution, income distributions
genome distribution » genomic distribution, gene distribution, monomer distribution
developed countries » developing countries
2 developed » 12 developed, _ developed, a developed

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 (genome distribution))) OR (income redistribution)) %2 developed countries%22.
• Adding a wildcard symbol may retrieve word variants: %((((22income distribution) or (genome distribution))) or (income redistribution)) %2 developed countries%22*.