Perhaps you should try some spelling variations:
petrov » petro (Expand Search), peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petriv » petris (Expand Search), peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petrouiv » peterouiv (Expand Search), petruouiv (Expand Search), petroouiv (Expand Search)
petruuiv » peteruuiv (Expand Search), petruuuiv (Expand Search), petrouuiv (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 ((petrov OR (petriv OR (petrouiv OR petruuiv))) OR (peteruo OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrov OR (petriv OR (petrouiv OR petruuiv))) OR (peteruo OR (petr OR petri))) o.s.*".