Perhaps you should try some spelling variations:
"agriculture laborers / italy / romagna / history / 18th century" » "agricultural labourers / italy / romagna / history / 18th century", "agriculture labour / italy / romagna / history / 18th century", "agricultural labourer / italy / romagna / history / 18th century"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"agricultural laborers / italy / romagna / history / 18th century\") OR (\"agriculture laborers / italy / romagna / history / 18th century\"))".
• Removing quotes may allow a broader search: (( agricultural laborers / italy / romagna / history / 18th century ) OR ( agriculture laborers / italy / romagna / history / 18th century )).
• Adding a wildcard symbol may retrieve word variants: (("agricultural laborers / italy / romagna / history / 18th century") OR ("agriculture laborers / italy / romagna / history / 18th century"))*.