Perhaps you should try some spelling variations:
petruoiv » petrov (Expand Search), peteruoiv (Expand Search), petruuoiv (Expand Search), petrouoiv (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petroi » peteroi (Expand Search), petruoi (Expand Search), petrooi (Expand Search)
petruooi » peteruooi (Expand Search), petruuooi (Expand Search), petrouooi (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 ((petruoiv OR petruov) OR (((petri OR (petroi OR petruooi)) OR peteru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruoiv OR petruov) OR (((petri OR (petroi OR petruooi)) OR peteru) OR petr)) o.s.*".