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