Perhaps you should try some spelling variations:
petrouov » petrov (Expand Search), peterouov (Expand Search), petruouov (Expand Search), petroouov (Expand Search)
petruouov » peteruouov (Expand Search), petruuouov (Expand Search), petrououov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruouo » peteruouo (Expand Search), petruuouo (Expand Search), petrououo (Expand Search)
petruoouo » peteruoouo (Expand Search), petruuoouo (Expand Search), petrouoouo (Expand Search)
petr » peter (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 ((petrouov OR petruouov) OR ((petri OR (petruouo OR petruoouo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrouov OR petruouov) OR ((petri OR (petruouo OR petruoouo)) OR petr)) o.s.*".