Perhaps you should try some spelling variations:
22income distribution » income distribution, income distributions, income redistribution
time distributions » time distribution, size distributions, stable distributions
762 developing » 7.2 developing, 2 developing, 12 developing
2f developing » f developing, 7 developing, self 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 (time distributions)) %((2f developing) OR (762 developing)) countries%22.
• Adding a wildcard symbol may retrieve word variants: %((22income distribution) or (time distributions)) %((2f developing) or (762 developing)) countries%22*.