Perhaps you should try some spelling variations:
learning inequality » learning quality, garding inequality, measuring inequality
learning ability » learning activity, learning about
wage » wave
earnings » warning
disabilities » capabilities

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