Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petriov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petruiv » petriuiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petrouiv » petriouiv (Expand Search), petruouiv (Expand Search), petroouiv (Expand Search)
petrioi » petriioi (Expand Search), petruioi (Expand Search), petroioi (Expand Search)
petrouoov » petriouoov (Expand Search), petruouoov (Expand Search), petroouoov (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (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 petrouiv) OR ((petrioi 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 petrouiv) OR ((petrioi OR (petrov OR petrouoov)) OR (petr OR peter))) o.s.*".