Perhaps you should try some spelling variations:
petro » petrov (Expand Search), petri (Expand Search), petero (Expand Search), petrio (Expand Search), pero (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), periov (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), periiv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), peru (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), perio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), per (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 petriiv) OR (petru OR ((((petro OR petero) OR pero) OR petrio) OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petriiv) OR (petru OR ((((petro OR petero) OR pero) OR petrio) OR petr))) o.s.*".