Perhaps you should try some spelling variations:
measuring inequality » measuring quality
reducing inequality » reducing inequalities, education inequality
hardy's inequality » hardy inequality, holder's inequality, harnack inequality
learning ability » learning disability, learning activity, learning about
wage » wave
earnings » 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 (((((((((learning quality) OR (learning ability))) OR (measuring inequality))) OR (hardy's inequality))) OR (earnings inequality)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "wage and ((reducing inequality) or (((((((((learning quality) OR (learning ability))) or (measuring inequality))) or (hardy's inequality))) or (earnings inequality))))".
• Adding a wildcard symbol may retrieve word variants: wage and ((reducing inequality) or (((((((((learning quality) OR (learning ability))) or (measuring inequality))) or (hardy's inequality))) or (earnings inequality))))*.