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