Perhaps you should try some spelling variations:
deepening inequality » explaining inequality
education inequality » educational inequality, education quality, educational quality
measuring inequality » measuring quality
reducing inequality » reducing inequalities
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 ((((reducing inequality) OR (education inequality))) OR (((((((deepening inequality) OR (measuring inequality))) OR (harnack inequality))) OR (earnings inequality)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "wage and ((((reducing inequality) OR (education inequality))) or (((((((deepening inequality) or (measuring inequality))) or (harnack inequality))) or (earnings inequality))))".
• Adding a wildcard symbol may retrieve word variants: wage and ((((reducing inequality) OR (education inequality))) or (((((((deepening inequality) or (measuring inequality))) or (harnack inequality))) or (earnings inequality))))*.