Perhaps you should try some spelling variations:
competing patterns » computing patterns, computing pattern, voting patterns
combing patterns » combine patterns, combining patterns, coding patterns
oecd wealth » oecd health, old wealth, lov'd wealth
oecd welt » oecd best

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: (( ((oecd wealth) OR (oecd welt)) competing patterns ) OR ( ((oecd wealth) OR (oecd welt)) combing patterns )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((oecd wealth) OR (oecd welt)) competing patterns ) or ( ((oecd wealth) OR (oecd welt)) combing patterns ))".
• Adding a wildcard symbol may retrieve word variants: (( ((oecd wealth) OR (oecd welt)) competing patterns ) or ( ((oecd wealth) OR (oecd welt)) combing patterns ))*.