Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruou » petriuou (Expand Search), petruuou (Expand Search), petrouou (Expand Search)
petruiu » petriuiu (Expand Search), petruuiu (Expand Search), petrouiu (Expand Search)
petrooi » petriooi (Expand Search), petruooi (Expand Search), petroooi (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (Expand Search)
petriou » petriiou (Expand Search), petruiou (Expand Search), petroiou (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 (petruiu OR petrooi)) OR ((petr OR petriou) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR ((petruou OR (petruiu OR petrooi)) OR ((petr OR petriou) OR peter))) o.s.*".