Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petriiiov » peteriiiov (Expand Search), petruiiiov (Expand Search), petroiiiov (Expand Search)
petrouiiov » peterouiiov (Expand Search), petruouiiov (Expand Search), petroouiiov (Expand Search)
petroiiuiov » peteroiiuiov (Expand Search), petruoiiuiov (Expand Search), petrooiiuiov (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 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 petri)) o.s.*".