Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruvw » peteruvw (Expand Search), petriuvw (Expand Search), petruuvw (Expand Search), petruw (Expand Search), petrovw (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petrov (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search), petru (Expand Search), petrov (Expand Search)
petruuv » peteruuv (Expand Search), petriuuv (Expand Search), petruuuv (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 petruvw) o) OR ((petr OR (petriov OR (petruv OR petruuv))) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR petruvw) o) OR ((petr OR (petriov OR (petruv OR petruuv))) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruov OR petruvw) o) OR ((petr OR (petriov OR (petruv OR petruuv))) _)). s.*.