Perhaps you should try some spelling variations:
petrov » peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petroouv » peteroouv (Expand Search), petrioouv (Expand Search), petruoouv (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petroou » peteroou (Expand Search), petrioou (Expand Search), petruoou (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 ((petrov OR (petriuv OR petroouv)) OR ((peteru OR (petrou OR petroou)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrov OR (petriuv OR petroouv)) OR ((peteru OR (petrou OR petroou)) OR petr)) o.s.*".