Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petruoiv » petrov (Expand Search), peteruoiv (Expand Search), petriuoiv (Expand Search), petruuoiv (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriuiiov » peteriuiiov (Expand Search), petriiuiiov (Expand Search), petruiuiiov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (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 ((((petriiov OR petruov) OR petriuiiov) OR petruoiv) OR ((petroi OR peteri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriiov OR petruov) OR petriuiiov) OR petruoiv) OR ((petroi OR peteri) OR petr)) o.s.*".