Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petroov (Expand Search), perov (Expand Search)
peterv » peters (Expand Search)
petruov » petrouov (Expand Search), peruov (Expand Search), pentruov (Expand Search)
petriov » petroiov (Expand Search), periov (Expand Search)
petri » petroi (Expand Search), peri (Expand Search)
petr » petro (Expand Search), per (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (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 (petriov OR petrov)) OR (petri OR peterv)) OR ((petr OR petru) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR (petriov OR petrov)) OR (petri OR peterv)) OR ((petr OR petru) OR peter)) o.s.*".