Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petroiov (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petroiiv (Expand Search)
petroio » peteroio (Expand Search), petrioio (Expand Search), petrooio (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petroou » peteroou (Expand Search), petrioou (Expand Search), petrooou (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 petriiv) OR ((petroio OR (petru OR petroou)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petriiv) OR ((petroio OR (petru OR petroou)) OR petr)) o.s.*".