Perhaps you should try some spelling variations:
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• Performing a fuzzy search may retrieve terms with similar spellings: (((((("rome's economic conditions 1300 b.c.-476 a.d.") or ("rome's economic connections _ b.c.-476 a.d."))) or ((((("rome's economic conditions 3 b.c.-476 a.d.") OR ("rome's economic conditions 7 b.c.-476 a.d."))) or ("rome's economic transitions _ b.c.-476 a.d."))))) or ("roman economic conditions de b.c.-476 a.d."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("rome's economic conditions 1300 b.c.-476 a.d.") OR ("rome's economic connections _ b.c.-476 a.d."))) OR ((((("rome's economic conditions 3 b.c.-476 a.d.") OR ("rome's economic conditions 7 b.c.-476 a.d."))) OR ("rome's economic transitions _ 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 1300 b.c.-476 a.d.\") or (\"rome's economic connections _ b.c.-476 a.d.\"))) or (((((\"rome's economic conditions 3 b.c.-476 a.d.\") OR (\"rome's economic conditions 7 b.c.-476 a.d.\"))) or (\"rome's economic transitions _ 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 1300 b.c.-476 a.d. ) or ( rome's economic connections _ b.c.-476 a.d. ))) or ((((( rome's economic conditions 3 b.c.-476 a.d. ) OR ( rome's economic conditions 7 b.c.-476 a.d. ))) or ( rome's economic transitions _ 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 1300 b.c.-476 a.d.") or ("rome's economic connections _ b.c.-476 a.d."))) or ((((("rome's economic conditions 3 b.c.-476 a.d.") OR ("rome's economic conditions 7 b.c.-476 a.d."))) or ("rome's economic transitions _ b.c.-476 a.d."))))) or ("roman economic conditions de b.c.-476 a.d."))*.