Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruiiv » peteruiiv (Expand Search), petruuiiv (Expand Search), petrouiiv (Expand Search)
petrouiiv » peterouiiv (Expand Search), petruouiiv (Expand Search), petroouiiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search), petroviiv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petrou » peterou (Expand Search), petruou (Expand Search), petroou (Expand Search), petru (Expand Search), petro (Expand Search), petrov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((petruiiv OR petrouiiv) OR ((peteriu OR petriov) OR (petr OR (petrou OR petri)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruiiv OR petrouiiv) OR ((peteriu OR petriov) OR (petr OR (petrou OR petri)))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruiiv OR petrouiiv) OR ((peteriu OR petriov) OR (petr OR (petrou OR petri)))) o.s.*.