Perhaps you should try some spelling variations:
petriov » petruiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petrov » petruov (Expand Search), petroov (Expand Search), perov (Expand Search), petro (Expand Search)
petruo » petruuo (Expand Search), petrouo (Expand Search), peruo (Expand Search), petru (Expand Search), petro (Expand Search)
petero » peters (Expand Search), petro (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 (petriov OR (((((petr OR petri) OR petrov) OR petero) OR petruo) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR (((((petr OR petri) OR petrov) OR petero) OR petruo) OR peter)) o.s.*".