Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petruiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petruov » petrov (Expand Search), petruuov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petruv » petru (Expand Search), petrov (Expand Search), petruuv (Expand Search), petrouv (Expand Search), peruv (Expand Search)
petroiv » petrov (Expand Search), petruoiv (Expand Search), petrooiv (Expand Search), peroiv (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petriiu » petruiiu (Expand Search), petroiiu (Expand Search), periiu (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (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 (petri OR petriiu)) OR (((petruov OR petruv) OR petroiv) OR petr)) OR peter) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR (petri OR petriiu)) OR (((petruov OR petruv) OR petroiv) OR petr)) OR peter) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR (petri OR petriiu)) OR (((petruov OR petruv) OR petroiv) OR petr)) OR peter) o.s.*.