Perhaps you should try some spelling variations:
22income distribution » income distribution, income distributions, income redistribution
genome distribution » genomic distribution, gene distribution, monomer distribution
time distributions » time distribution, size distributions, stable distributions
2f developing » f developing, 2.3 developing, 2.2 developing
72 developing » 7.2 developing, 762 developing, 2 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 (genome distribution))) OR (time distributions)) %((2f developing) OR (72 developing)) countries%22.
• Adding a wildcard symbol may retrieve word variants: %((((22income distribution) or (genome distribution))) or (time distributions)) %((2f developing) or (72 developing)) countries%22*.