Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petruov (Expand Search), petroov (Expand Search), perov (Expand Search)
petruiv » petruuiv (Expand Search), petrouiv (Expand Search), peruiv (Expand Search)
petruuiv » petruuuiv (Expand Search), petrouuiv (Expand Search), peruuiv (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petrouoov » petruouoov (Expand Search), petroouoov (Expand Search), perouoov (Expand Search)
petr » petru (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 ((petruiv OR petruuiv) OR ((petri OR (petrov OR petrouoov)) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruiv OR petruuiv) OR ((petri OR (petrov OR petrouoov)) OR (petr OR peter))) o.s.*".