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

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