Perhaps you should try some spelling variations:
warning inequality » learning inequality, widening inequality, facing inequality
garding inequality » garding's inequality, hardy inequality, hardy's inequality
wage » wave
earnings » learning

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 ((((warning inequality) OR (garding inequality))) OR (earnings inequality)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "wage and ((((warning inequality) OR (garding inequality))) or (earnings inequality))".
• Adding a wildcard symbol may retrieve word variants: wage and ((((warning inequality) OR (garding inequality))) or (earnings inequality))*.