Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petriu » petri (Expand Search), petru (Expand Search), petris (Expand Search), petriiu (Expand Search), petruiu (Expand Search), petroiu (Expand Search)
petrou » petru (Expand Search), petro (Expand Search), petrov (Expand Search), petriou (Expand Search), petruou (Expand Search), petroou (Expand Search)
petroi » petri (Expand Search), petro (Expand Search), petrov (Expand Search), petrioi (Expand Search), petruoi (Expand Search), petrooi (Expand Search)
petruou » petriuou (Expand Search), petruuou (Expand Search), petrouou (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (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 (petriov OR ((petruou OR ((petriu OR petrou) OR petroi)) OR ((petr OR petrou) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR ((petruou OR ((petriu OR petrou) OR petroi)) OR ((petr OR petrou) OR peter))) o.s.*".