Perhaps you should try some spelling variations:
petrioiv » petrov (Expand Search), peterioiv (Expand Search), petriioiv (Expand Search), petruioiv (Expand Search)
petroov » peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petruiio (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petriiu » peteriiu (Expand Search), petriiiu (Expand Search), petruiiu (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 ((petroov OR petrioiv) OR (((petriio OR peterio) OR (petriu OR petriiu)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroov OR petrioiv) OR (((petriio OR peterio) OR (petriu OR petriiu)) OR petr)) o.s.*".