Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petru » pentru (Expand Search), petrou (Expand Search), peru (Expand Search)
petruo » pentruo (Expand Search), petrouo (Expand Search), peruo (Expand Search), petro (Expand Search)
petrv » petrov (Expand Search), petro (Expand Search), petra (Expand Search), perv (Expand Search)
petri » petroi (Expand Search), peri (Expand Search)
petr » petro (Expand Search), per (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 (((((petru OR petri) OR (petrv OR petr)) OR petero) OR petruo) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR (((((petru OR petri) OR (petrv OR petr)) OR petero) OR petruo) OR peter)) o.s.*".