Perhaps you should try some spelling variations:
learning inequality » earnings inequality, learning quality, measuring inequality
warning inequality » earnings inequality, widening inequality, facing inequality
garding inequality » garding's inequality, earnings inequality, hardy inequality

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: wave AND ((warning inequality) OR (((learning inequality) OR (garding inequality)))).
• Adding a wildcard symbol may retrieve word variants: wave and ((warning inequality) or (((learning inequality) or (garding inequality))))*.