Perhaps you should try some spelling variations:
petroov » peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (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 (petroov OR petriov)) OR (petriv OR petriiv)) OR (petroi OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petroov OR (petroov OR petriov)) OR (petriv OR petriiv)) OR (petroi OR petr)) o.s.*".