Perhaps you should try some spelling variations:
"ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifa's life khayyat." » "ʻusfuri, khalaf ibn khayyat, -854. tarikh khalifa's life khayyat." (Expand Search), "ʻusfuri, khalifah al khayyat, -854. tarikh khalifa's life khayyat." (Expand Search)
"ʻusfuri, khalifah ibn hayyan, -854. tarikh khalij's ibn hayyan." » "ʻusfuri, khalaf ibn hayyan, -854. tarikh khalij's ibn hayyan." (Expand Search), "ʻusfuri, khalifah al hayyan, -854. tarikh khalij's ibn hayyan." (Expand Search), "ʻusfuri, khalifah ibn hayyan, -854. tarikh khalifa ibn hayyan." (Expand Search), "ʻusfuri, khalifah abu hayyan, -854. tarikh khalij's abu hayyan." (Expand Search)
"ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifah ibn khayyat." » "ʻusfuri, khalaf ibn khayyat, -854. tarikh khalaf ibn khayyat." (Expand Search), "ʻusfuri, khalifah al khayyat, -854. tarikh khalifah al khayyat." (Expand Search)
"ʻusfuri, khalil ibn hayyan, -854. tarikh khalij's ibn hayyan." » "ʻusfuri, khalil ibn hayyan, -854. tarikh khalifa ibn hayyan." (Expand Search), "ʻusfuri, khalil abu hayyan, -854. tarikh khalij's abu hayyan." (Expand Search)
"ʻusfuri, khalid ibn hayyan, -854. tarikh khalij's ibn hayyan." » "ʻusfuri, khalid ibn hayyan, -854. tarikh khalifa ibn hayyan." (Expand Search), "ʻusfuri, khalid abu hayyan, -854. tarikh khalij's abu hayyan." (Expand Search), "ʻusfuri, walid ibn hayyan, -854. tarikh khalij's ibn hayyan." (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifa's life khayyat.") or ((((("ʻusfuri, khalifah ibn hayyan, -854. tarikh khalij's ibn hayyan.") OR ("ʻusfuri, khalil ibn hayyan, -854. tarikh khalij's ibn hayyan."))) or ("ʻusfuri, khalid ibn hayyan, -854. tarikh khalij's ibn hayyan."))))) or ("ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifah ibn khayyat."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifa's life khayyat.") OR ((((("ʻusfuri, khalifah ibn hayyan, -854. tarikh khalij's ibn hayyan.") OR ("ʻusfuri, khalil ibn hayyan, -854. tarikh khalij's ibn hayyan."))) OR ("ʻusfuri, khalid ibn hayyan, -854. tarikh khalij's ibn hayyan."))))) OR ("ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifah ibn khayyat.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifa's life khayyat.\") or (((((\"ʻusfuri, khalifah ibn hayyan, -854. tarikh khalij's ibn hayyan.\") OR (\"ʻusfuri, khalil ibn hayyan, -854. tarikh khalij's ibn hayyan.\"))) or (\"ʻusfuri, khalid ibn hayyan, -854. tarikh khalij's ibn hayyan.\"))))) or (\"ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifah ibn khayyat.\"))".
• Removing quotes may allow a broader search: (((( ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifa's life khayyat. ) or ((((( ʻusfuri, khalifah ibn hayyan, -854. tarikh khalij's ibn hayyan. ) OR ( ʻusfuri, khalil ibn hayyan, -854. tarikh khalij's ibn hayyan. ))) or ( ʻusfuri, khalid ibn hayyan, -854. tarikh khalij's ibn hayyan. ))))) or ( ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifah ibn khayyat. )).
• Adding a wildcard symbol may retrieve word variants: (((("ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifa's life khayyat.") or ((((("ʻusfuri, khalifah ibn hayyan, -854. tarikh khalij's ibn hayyan.") OR ("ʻusfuri, khalil ibn hayyan, -854. tarikh khalij's ibn hayyan."))) or ("ʻusfuri, khalid ibn hayyan, -854. tarikh khalij's ibn hayyan."))))) or ("ʻusfuri, khalifah ibn khayyat, -854. tarikh khalifah ibn khayyat."))*.

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