Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petriov (Expand Search), petroov (Expand Search), perov (Expand Search)
petrio » petri (Expand Search), petro (Expand Search), petriio (Expand Search), petroio (Expand Search), perio (Expand Search)
petriu » petri (Expand Search), petriiu (Expand Search), petroiu (Expand Search), periu (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petris » petri (Expand Search), petriis (Expand Search), petrois (Expand Search), peris (Expand Search)
petriiiv » petriiiiv (Expand Search), petroiiiv (Expand Search), periiiv (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (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 ((petriiiv OR petrov) OR ((petrio OR ((petriu OR petru) OR petris)) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiiv OR petrov) OR ((petrio OR ((petriu OR petru) OR petris)) OR (petr OR peter))) o.s.*".