Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petriov (Expand Search), petroov (Expand Search), perov (Expand Search)
petriov » petriv (Expand Search), petrisv (Expand Search), petrov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petrio » petri (Expand Search), petris (Expand Search), petro (Expand Search), petriio (Expand Search), petroio (Expand Search), perio (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petrou » petro (Expand Search), petrow (Expand Search), petriou (Expand Search), petroou (Expand Search), perou (Expand Search)
petr » petri (Expand Search), petro (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 (petrov OR peteriv)) OR ((petrio OR (petru OR petrou)) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR (petrov OR peteriv)) OR ((petrio OR (petru OR petrou)) OR (petr OR peter))) o.s.*".