Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petroiov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petrouov (Expand Search)
petroouov » peteroouov (Expand Search), petrioouov (Expand Search), petrooouov (Expand Search)
petriouov » peteriouov (Expand Search), petriiouov (Expand Search), petroiouov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petr » peter (Expand Search), petri (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 peterov) OR (petruov OR (petroouov OR petriouov))) OR (petru OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR peterov) OR (petruov OR (petroouov OR petriouov))) OR (petru OR petr)) o.s.*".