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