Perhaps you should try some spelling variations:
petrov » petro (Expand Search), peterov (Expand Search), petriov (Expand Search), petroov (Expand Search)
petris » petri (Expand Search), peteris (Expand Search), petriis (Expand Search), petrois (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petroiov (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search), petri (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petroou (Expand Search), petro (Expand Search), petrow (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 petrov) OR ((peteruo OR petris) OR (petr OR ((petru OR petrou) OR pentru)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petrov) OR ((peteruo OR petris) OR (petr OR ((petru OR petrou) OR pentru)))) o.s.*".