Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), peteroov (Expand Search), petrooov (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search)
petruo » pentruo (Expand Search), petro (Expand Search), peteruo (Expand Search), petrouo (Expand Search)
petrou » petro (Expand Search), petrov (Expand Search), petrow (Expand Search), peterou (Expand Search), petroou (Expand Search)
petr » peter (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petroi (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 ((((petru OR petrou) OR petrou) OR petruo) OR ((per OR petr) OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petroov OR ((((petru OR petrou) OR petrou) OR petruo) OR ((per OR petr) OR petri))) o.s.*".