Perhaps you should try some spelling variations:
garding's inequality » hardy's inequality, young's inequality, korn's inequality
learning inequality » measuring inequality, deepening inequality, reducing inequality
garding inequality » hardy inequality, hardy's inequality, rising inequality
learning quality » learning ability
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 (learning quality))) OR (((((garding inequality) OR (garding's inequality))) OR (earnings inequality)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "wage and ((((learning inequality) OR (learning quality))) or (((((garding inequality) or (garding's inequality))) or (earnings inequality))))".
• Adding a wildcard symbol may retrieve word variants: wage and ((((learning inequality) OR (learning quality))) or (((((garding inequality) or (garding's inequality))) or (earnings inequality))))*.