Perhaps you should try some spelling variations:
"petri / iberieli / ca. 411-ca. 490" » "petri / iberien / ca. 411-ca. 490"
"petri / iberici / ca. 411-ca. 490" » "petri / iberica / ca. 411-ca. 490", "petri / iberico / ca. 411-ca. 490", "petri / iberic / ca. 411-ca. 490"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"petri / iberieli / ca. 411-ca. 490\") OR (\"petri / iberici / ca. 411-ca. 490\"))".
• Removing quotes may allow a broader search: (( petri / iberieli / ca. 411-ca. 490 ) OR ( petri / iberici / ca. 411-ca. 490 )).
• Adding a wildcard symbol may retrieve word variants: (("petri / iberieli / ca. 411-ca. 490") OR ("petri / iberici / ca. 411-ca. 490"))*.