Perhaps you should try some spelling variations:
"oecd healthy cropping patterns" » "oecd healthy changing patterns", "oecd healthy drinking patterns", "oecd healthy folding patterns", "oecd healthy coping patterns", "oecd healthy coding patterns", "oecd healthy cooking patterns", "oecd health cropping patterns", "old healthy cropping patterns", "oecd wealth cropping patterns"
"oecd healthy cropping pattern" » "oecd healthy coping pattern", "oecd healthy coding pattern", "oecd healthy cooking pattern", "oecd healthy changing pattern", "oecd health cropping pattern", "old healthy cropping pattern", "oecd wealth cropping pattern"
"oecd healthy evolving patterns" » "oecd heart evolving patterns", "oecd hierarchy evolving patterns", "oecd healthy eating patterns", "oecd health evolving patterns", "old healthy evolving patterns", "oecd wealth evolving patterns"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd healthy cropping patterns") OR ("oecd healthy evolving patterns"))) OR ("oecd healthy cropping pattern")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd healthy cropping patterns\") OR (\"oecd healthy evolving patterns\"))) or (\"oecd healthy cropping pattern\"))".
• Removing quotes may allow a broader search: (((( oecd healthy cropping patterns ) OR ( oecd healthy evolving patterns ))) or ( oecd healthy cropping pattern )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd healthy cropping patterns") OR ("oecd healthy evolving patterns"))) or ("oecd healthy cropping pattern"))*.