Perhaps you should try some spelling variations:
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• Performing a fuzzy search may retrieve terms with similar spellings: (((("rome economic conditions 30 b.c.-476 a.d.") OR ("home economics conditions 30 b.c.-476 a.d."))) or ((((("rome economic conditions _ b.c.-476 a.d.") or ("rome economic conditions 43 b.c.-476 a.d."))) or ("rome economic conditions 1250 b.c.-476 a.d."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("rome economic conditions 30 b.c.-476 a.d.") OR ("home economics conditions 30 b.c.-476 a.d."))) OR ((((("rome economic conditions _ b.c.-476 a.d.") OR ("rome economic conditions 43 b.c.-476 a.d."))) OR ("rome economic conditions 1250 b.c.-476 a.d.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"rome economic conditions 30 b.c.-476 a.d.\") OR (\"home economics conditions 30 b.c.-476 a.d.\"))) or (((((\"rome economic conditions _ b.c.-476 a.d.\") or (\"rome economic conditions 43 b.c.-476 a.d.\"))) or (\"rome economic conditions 1250 b.c.-476 a.d.\"))))".
• Removing quotes may allow a broader search: (((( rome economic conditions 30 b.c.-476 a.d. ) OR ( home economics conditions 30 b.c.-476 a.d. ))) or ((((( rome economic conditions _ b.c.-476 a.d. ) or ( rome economic conditions 43 b.c.-476 a.d. ))) or ( rome economic conditions 1250 b.c.-476 a.d. )))).
• Adding a wildcard symbol may retrieve word variants: (((("rome economic conditions 30 b.c.-476 a.d.") OR ("home economics conditions 30 b.c.-476 a.d."))) or ((((("rome economic conditions _ b.c.-476 a.d.") or ("rome economic conditions 43 b.c.-476 a.d."))) or ("rome economic conditions 1250 b.c.-476 a.d."))))*.