Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), petruuov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petroiv » petrov (Expand Search), petruoiv (Expand Search), petrooiv (Expand Search), peroiv (Expand Search)
petrv » petrov (Expand Search), petru (Expand Search), petro (Expand Search), petruv (Expand Search), perv (Expand Search)
peters » petersen (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), 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 petruov) OR petroiv) OR (petrv OR peters)) OR ((petr OR petri) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruov OR petruov) OR petroiv) OR (petrv OR peters)) OR ((petr OR petri) OR peter)) o.s.*".