Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petriv » peteriv (Expand Search), petroiv (Expand Search), periv (Expand Search)
petriiv » peteriiv (Expand Search), petroiiv (Expand Search), periiv (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petriu » peteriu (Expand Search), petroiu (Expand Search), periu (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (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 (petriv OR petriiv)) OR (((petri OR perio) OR (petru OR petriu)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR (petriv OR petriiv)) OR (((petri OR perio) OR (petru OR petriu)) OR petr)) o.s.*".