Perhaps you should try some spelling variations:
peteriov » petrov (Expand Search)
perov » petrov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrou » peterou (Expand Search), petruou (Expand Search), petroou (Expand Search)
petrui » peterui (Expand Search), petruui (Expand Search), petroui (Expand Search)
petriuo » peteriuo (Expand Search), petruiuo (Expand Search), petroiuo (Expand Search)
petr » peter (Expand Search), petru (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 ((peteriov OR perov) OR (((((petri OR perio) OR petrou) OR petrui) OR petriuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteriov OR perov) OR (((((petri OR perio) OR petrou) OR petrui) OR petriuo) OR petr)) o.s.*".