Perhaps you should try some spelling variations:
"anglo-french war, 1755-1763 / treating" » "anglo-french war, 1755-1763 / creating", "anglo-french war, 1755-1763 / treatise"
"angle-french war, 1755-1763 / treating" » "angle-french war, 1755-1763 / creating", "angle-french war, 1755-1763 / treatise"

Try widening your search to All Fields.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"anglo-french war, 1755-1763 / treating\") OR (\"angle-french war, 1755-1763 / treating\"))".
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• Adding a wildcard symbol may retrieve word variants: (("anglo-french war, 1755-1763 / treating") OR ("angle-french war, 1755-1763 / treating"))*.