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• 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 condition _ b.c.-476 a.d.") OR ("rome's economic foundations _ b.c.-476 a.d."))))) OR ((("rome's economic connection _ b.c.-476 a.d.") OR ("rome's economic transitions 7 b.c.-476 a.d."))))) OR ("roman economic conditions de 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 condition _ b.c.-476 a.d.\") OR (\"rome's economic foundations _ b.c.-476 a.d.\"))))) or (((\"rome's economic connection _ b.c.-476 a.d.\") or (\"rome's economic transitions 7 b.c.-476 a.d.\"))))) or (\"roman economic conditions de 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 condition _ b.c.-476 a.d. ) OR ( rome's economic foundations _ b.c.-476 a.d. ))))) or ((( rome's economic connection _ b.c.-476 a.d. ) or ( rome's economic transitions 7 b.c.-476 a.d. ))))) or ( roman economic conditions de 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 condition _ b.c.-476 a.d.") OR ("rome's economic foundations _ b.c.-476 a.d."))))) or ((("rome's economic connection _ b.c.-476 a.d.") or ("rome's economic transitions 7 b.c.-476 a.d."))))) or ("roman economic conditions de b.c.-476 a.d."))*.