Perhaps you should try some spelling variations:
petrov » petriv (Expand Search), petruv (Expand Search), peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petro » petri (Expand Search), petru (Expand Search), petero (Expand Search), petrio (Expand Search), petruo (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petriuo » peteriuo (Expand Search), petriiuo (Expand Search), petruiuo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((peteriov OR (petrov OR perov)) OR ((((petro OR petrio) OR petrui) OR petriuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteriov OR (petrov OR perov)) OR ((((petro OR petrio) OR petrui) OR petriuo) OR petr)) o.s.*".