Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petroov (Expand Search), perov (Expand Search)
petruv » petrouv (Expand Search), peruv (Expand Search), pentruv (Expand Search)
petr » petro (Expand Search), per (Expand Search)
petruoi » petrouoi (Expand Search), peruoi (Expand Search), pentruoi (Expand Search)
petri » petroi (Expand Search), peri (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petruuo » petrouuo (Expand Search), peruuo (Expand Search), pentruuo (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((petruv OR petrov) OR (((petr OR ((petruoi OR petri) OR petru)) OR petruuo) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR petrov) OR (((petr OR ((petruoi OR petri) OR petru)) OR petruuo) OR peter)) o.s.*".