Perhaps you should try some spelling variations:
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petruiiiv » peteruiiiv (Expand Search), petriuiiiv (Expand Search), petruuiiiv (Expand Search)
petroiiov » peteroiiov (Expand Search), petrioiiov (Expand Search), petruoiiov (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petruuo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((((petriv OR petruiiiv) OR petroiiov) OR petriuv) OR ((peterou OR petruo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriv OR petruiiiv) OR petroiiov) OR petriuv) OR ((peterou OR petruo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriv OR petruiiiv) OR petroiiov) OR petriuv) OR ((peterou OR petruo) OR petr)) o.s.*.