Perhaps you should try some spelling variations:
deepening inequality » explaining inequality, earnings inequality, measuring inequality
learning inequality » earnings inequality, learning quality, measuring inequality
garding inequality » garding's inequality, earnings inequality, hardy's 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 ((deepening inequality) OR (((garding inequality) OR (learning inequality)))).
• Adding a wildcard symbol may retrieve word variants: wage and ((deepening inequality) or (((garding inequality) or (learning inequality))))*.