Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), petrouov (Expand Search), peruov (Expand Search), pentruov (Expand Search)
petroo » petro (Expand Search), petrov (Expand Search), petrow (Expand Search), petrooo (Expand Search), peroo (Expand Search)
petroou » petrou (Expand Search), petrovu (Expand Search), petrowu (Expand Search), petrooou (Expand Search), peroou (Expand Search)
petr » petro (Expand Search), per (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petri » petroi (Expand Search), peri (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 (petruov OR ((petroo OR petroo) OR ((petr OR ((petru OR petroou) OR petri)) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petruov OR ((petroo OR petroo) OR ((petr OR ((petru OR petroou) OR petri)) OR peter))) o.s.*".