Perhaps you should try some spelling variations:
income distributions » income redistribution, time distributions, discrete distributions
selturf developing » culture developing, self developing, feature developing
turf developing » stuff developing, future developing, tariff developing

Try widening your search to All Fields.

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 distribution) OR (income distributions)) %((selturf developing) OR (turf developing)) countries%22.
• Adding a wildcard symbol may retrieve word variants: %((income distribution) or (income distributions)) %((selturf developing) or (turf developing)) countries%22*.