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