Perhaps you should try some spelling variations:
"oecd fao, agriculture and fisheries part" » "oecd fao, agriculture and fisheries act", "oecd fao, agriculture and fisheries a", "oecd fao, agriculture and fisheries data", "oecd dac, agriculture and fisheries part"
"oecd fao, agriculture and fisher's paper" » "oecd fao, agriculture and finsler's papers", "oecd fao, agriculture and fisheries papers", "oecd fao, agriculture and foster's papers", "oecd dac, agriculture and fisher's paper"
"oecd fao, agriculture and wishart's paper" » "oecd dac, agriculture and wishart's paper"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("oecd fao, agriculture and fisheries part") OR ((("oecd fao, agriculture and fisher's paper") OR ("oecd fao, agriculture and wishart's paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"oecd fao, agriculture and fisheries part\") or (((\"oecd fao, agriculture and fisher's paper\") OR (\"oecd fao, agriculture and wishart's paper\"))))".
• Removing quotes may allow a broader search: (( oecd fao, agriculture and fisheries part ) or ((( oecd fao, agriculture and fisher's paper ) OR ( oecd fao, agriculture and wishart's paper )))).
• Adding a wildcard symbol may retrieve word variants: (("oecd fao, agriculture and fisheries part") or ((("oecd fao, agriculture and fisher's paper") OR ("oecd fao, agriculture and wishart's paper"))))*.