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• Performing a fuzzy search may retrieve terms with similar spellings: (((((("rome's economic conditions 160 b.c.-476 a.d.") or ((("rome's economic location 40 b.c.-476 a.d.") OR ("rome's economic relations 40 b.c.-476 a.d."))))) or ("rome's economic foundations _ b.c.-476 a.d."))) or ("roman economy transactions _ b.c.-476 a.d."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("rome's economic conditions 160 b.c.-476 a.d.") OR ((("rome's economic location 40 b.c.-476 a.d.") OR ("rome's economic relations 40 b.c.-476 a.d."))))) OR ("rome's economic foundations _ b.c.-476 a.d."))) OR ("roman economy transactions _ b.c.-476 a.d.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"rome's economic conditions 160 b.c.-476 a.d.\") or (((\"rome's economic location 40 b.c.-476 a.d.\") OR (\"rome's economic relations 40 b.c.-476 a.d.\"))))) or (\"rome's economic foundations _ b.c.-476 a.d.\"))) or (\"roman economy transactions _ b.c.-476 a.d.\"))".
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• Adding a wildcard symbol may retrieve word variants: (((((("rome's economic conditions 160 b.c.-476 a.d.") or ((("rome's economic location 40 b.c.-476 a.d.") OR ("rome's economic relations 40 b.c.-476 a.d."))))) or ("rome's economic foundations _ b.c.-476 a.d."))) or ("roman economy transactions _ b.c.-476 a.d."))*.