Perhaps you should try some spelling variations:
petrov » petro (Expand Search), peterov (Expand Search), petroov (Expand Search), perov (Expand Search)
peters » peter (Expand Search), petersen (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petriv » peteriv (Expand Search), petroiv (Expand Search), periv (Expand Search), petris (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (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 (((pentruov OR pentru) OR petrov) OR ((((petri OR peters) OR petr) OR petriv) OR petru)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((pentruov OR pentru) OR petrov) OR ((((petri OR peters) OR petr) OR petriv) OR petru)) o.s.*".