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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 conditions 1560 b.c.-476 a.d."))) or ("rome's economic location _0 b.c.-476 a.d."))) or ("rome's economic foundations 31 b.c.-476 a.d."))) or ("roman economic connection _ 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 conditions 1560 b.c.-476 a.d."))) OR ("rome's economic location _0 b.c.-476 a.d."))) OR ("rome's economic foundations 31 b.c.-476 a.d."))) OR ("roman economic connection _ 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 conditions 1560 b.c.-476 a.d.\"))) or (\"rome's economic location _0 b.c.-476 a.d.\"))) or (\"rome's economic foundations 31 b.c.-476 a.d.\"))) or (\"roman economic connection _ b.c.-476 a.d.\"))".
• Removing quotes may allow a broader search: (((((((( rome's economic conditions 160 b.c.-476 a.d. ) OR ( rome's economic conditions 1560 b.c.-476 a.d. ))) or ( rome's economic location _0 b.c.-476 a.d. ))) or ( rome's economic foundations 31 b.c.-476 a.d. ))) or ( roman economic connection _ b.c.-476 a.d. )).
• Adding a wildcard symbol may retrieve word variants: (((((((("rome's economic conditions 160 b.c.-476 a.d.") OR ("rome's economic conditions 1560 b.c.-476 a.d."))) or ("rome's economic location _0 b.c.-476 a.d."))) or ("rome's economic foundations 31 b.c.-476 a.d."))) or ("roman economic connection _ b.c.-476 a.d."))*.