Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petriiv » peteriiv (Expand Search), petroiiv (Expand Search), periiv (Expand Search)
petrouiiv » peterouiiv (Expand Search), petroouiiv (Expand Search), perouiiv (Expand Search)
petroiu » peteroiu (Expand Search), petrooiu (Expand Search), peroiu (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (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 ((petriiv OR petrouiiv) OR ((petroiu OR petriov) OR (petr OR (petru OR petri)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiv OR petrouiiv) OR ((petroiu OR petriov) OR (petr OR (petru OR petri)))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiv OR petrouiiv) OR ((petroiu OR petriov) OR (petr OR (petru OR petri)))) o.s.*.