Perhaps you should try some spelling variations:
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petroou » peteroou (Expand Search), petrioou (Expand Search), petruoou (Expand Search)
petrooou » peterooou (Expand Search), petriooou (Expand Search), petruooou (Expand Search)
petruou » peteruou (Expand Search), petriuou (Expand Search), petruuou (Expand Search)
petruioi » peteruioi (Expand Search), petriuioi (Expand Search), petruuioi (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 (petruov OR ((((petroou OR petrooou) OR petruou) OR (petruioi OR petruioi)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petruov OR ((((petroou OR petrooou) OR petruou) OR (petruioi OR petruioi)) OR petr)) o.s.*".