Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petriov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petriiv » petriiiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petruiiv » petriuiiv (Expand Search), petruuiiv (Expand Search), petrouiiv (Expand Search)
petrouo » petriouo (Expand Search), petruouo (Expand Search), petroouo (Expand Search)
petrooiu » petriooiu (Expand Search), petruooiu (Expand Search), petroooiu (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 (((petrov OR petriiv) OR petruiiv) OR ((petrouo OR petrooiu) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrov OR petriiv) OR petruiiv) OR ((petrouo OR petrooiu) OR (petr OR peter))) o.s.*".