Perhaps you should try some spelling variations:
garding's inequality » garding inequality, earnings inequality, hardy's inequality
warning inequality » earnings inequality, learning inequality, garding inequality
learning quality » learning ability
hardy inequality » hardy's inequality, hardy inequalities, harnack inequality
wage » wave

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 quality) OR (((((hardy inequality) OR (garding's inequality))) OR (warning inequality)))).
• Adding a wildcard symbol may retrieve word variants: wage and ((learning quality) or (((((hardy inequality) or (garding's inequality))) or (warning inequality))))*.