Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), petriuov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petriiuiiv » petriiiuiiv (Expand Search), petruiiuiiv (Expand Search), petroiiuiiv (Expand Search)
petrouo » petriouo (Expand Search), petruouo (Expand Search), petroouo (Expand Search)
petriouo » petriiouo (Expand Search), petruiouo (Expand Search), petroiouo (Expand Search)
petriiu » petriiiu (Expand Search), petruiiu (Expand Search), petroiiu (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 ((petruov OR petriiuiiv) OR (((petrouo OR petriouo) OR petriiu) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR petriiuiiv) OR (((petrouo OR petriouo) OR petriiu) OR (petr OR peter))) o.s.*".