Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petroiov (Expand Search)
petrv » peterv (Expand Search), petriv (Expand Search), petrov (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petrouv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petroio (Expand Search)
petriiio » peteriiio (Expand Search), petriiiio (Expand Search), petroiiio (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 (petrv OR petruv)) OR ((((petru OR petrio) OR petero) OR petriiio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR (petrv OR petruv)) OR ((((petru OR petrio) OR petero) OR petriiio) OR petr)) o.s.*".