Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petru » petriu (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search), petri (Expand Search)
petrou » petriou (Expand Search), petroou (Expand Search), perou (Expand Search), petro (Expand Search), petrov (Expand Search), petrow (Expand Search)
petriow » petriiow (Expand Search), petroiow (Expand Search), periow (Expand Search), petrow (Expand Search)
petroiu » petrioiu (Expand Search), petrooiu (Expand Search), peroiu (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 (petriov OR ((petr OR ((petru OR ((petrou OR peroou) OR petriow)) OR petroiu)) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR ((petr OR ((petru OR ((petrou OR peroou) OR petriow)) OR petroiu)) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriov OR ((petr OR ((petru OR ((petrou OR peroou) OR petriow)) OR petroiu)) OR peter)) o.s.*.