Perhaps you should try some spelling variations:
income distributions » income distribution, income redistribution, time distributions
genome distribution » genomic distribution, gene distribution, monomer distribution
20 development » 10 development
2f developing » f developing, 2.3 developing, 2.2 developing
20 developing » 10 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: %((genome distribution) OR (income distributions)) %((2f developing) OR (((20 developing) OR (20 development)))) countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((genome distribution) or (income distributions)) %((2f developing) or (((20 developing) OR (20 development)))) countries%22".
• Adding a wildcard symbol may retrieve word variants: %((genome distribution) or (income distributions)) %((2f developing) or (((20 developing) OR (20 development)))) countries%22*.