Perhaps you should try some spelling variations:
income distributions » income distribution, income redistribution, discrete distributions
time distributions » time distribution, size distributions, time distributed
turf developing » stuff developing, future developing, tariff 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: %((income distributions) OR (((time distributions) OR (stable distributions)))) %turf developing countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((income distributions) or (((time distributions) OR (stable distributions)))) %turf developing countries%22".
• Adding a wildcard symbol may retrieve word variants: %((income distributions) or (((time distributions) OR (stable distributions)))) %turf developing countries%22*.