Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petruiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petriiiov » petruiiiov (Expand Search), petroiiiov (Expand Search), periiiov (Expand Search)
petrouiiov » petruouiiov (Expand Search), petroouiiov (Expand Search), perouiiov (Expand Search)
petroiiuiov » petruoiiuiov (Expand Search), petrooiiuiov (Expand Search), peroiiuiov (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (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 (petriiiov OR petrouiiov)) OR petroiiuiov) OR ((petr OR peter) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR (petriiiov OR petrouiiov)) OR petroiiuiov) OR ((petr OR peter) OR petri)) o.s.*".