Perhaps you should try some spelling variations:
petriv » petris (Expand Search), peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petrov » petro (Expand Search), peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petruov » petruv (Expand Search), petrov (Expand Search), peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petruo » petru (Expand Search), petro (Expand Search), peteruo (Expand Search), petruuo (Expand Search), petrouo (Expand Search)
petrui » petru (Expand Search), peterui (Expand Search), petruui (Expand Search), petroui (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((petruov OR ((petriv OR petrov) OR periiv)) OR ((petruo OR (petrui OR petr)) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR ((petriv OR petrov) OR periiv)) OR ((petruo OR (petrui OR petr)) OR petri)) o.s.*".