Perhaps you should try some spelling variations:
petrv » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petriv (Expand Search), petruv (Expand Search)
petriv » petri (Expand Search), petrov (Expand Search), petriiv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (Expand Search)
petris » petriis (Expand Search), petruis (Expand Search), petrois (Expand Search), petri (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 ((((petrv OR petriv) OR petriov) OR (petr OR petris)) OR peter) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrv OR petriv) OR petriov) OR (petr OR petris)) OR peter) o.s.*".