Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), petruuov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petruiu » petruuiu (Expand Search), petrouiu (Expand Search), peruiu (Expand Search)
petroouiu » petruoouiu (Expand Search), petrooouiu (Expand Search), peroouiu (Expand Search)
petriiiiv » petruiiiiv (Expand Search), petroiiiiv (Expand Search), periiiiv (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (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 (((petruov OR (petruiu OR petroouiu)) OR petriiiiv) OR ((petr OR petri) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR (petruiu OR petroouiu)) OR petriiiiv) OR ((petr OR petri) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruov OR (petruiu OR petroouiu)) OR petriiiiv) OR ((petr OR petri) OR peter)) o.s.*.