Perhaps you should try some spelling variations:
22income distribution » income distribution, income redistribution, genome distribution
genomic distribution » genome distribution, dynamic distribution, economics distribution
income distributions » income distribution, income redistribution, time distributions
7.2 developing » 5.2 developing, 12 developing, 22 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 (genomic distribution))) OR (income distributions)) %7.2 developing countries%22.
• Adding a wildcard symbol may retrieve word variants: %((((22income distribution) or (genomic distribution))) or (income distributions)) %7.2 developing countries%22*.