Perhaps you should try some spelling variations:
deepening inequality » explaining inequality, measuring inequality, reducing inequality
holder's inequality » hardy's inequality
garding inequality » garding's inequality, hardy inequality, hardy's inequality
wage » wave
earnings » learning, warning

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 (holder's inequality))) OR (earnings inequality)))).
• Adding a wildcard symbol may retrieve word variants: wage and ((deepening inequality) or (((((garding inequality) or (holder's inequality))) or (earnings inequality))))*.