Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petroov (Expand Search), perov (Expand Search)
petruo » petro (Expand Search), petrouo (Expand Search), peruo (Expand Search), pentruo (Expand Search)
peteri » peterdi (Expand Search), peters (Expand Search)
petrio » petris (Expand Search), petro (Expand Search), petroio (Expand Search), perio (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 (petri OR ((((petrov OR petruo) OR peteri) OR petrio) OR ((petr OR petru) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petri OR ((((petrov OR petruo) OR peteri) OR petrio) OR ((petr OR petru) OR peter))) o.s.*".