Perhaps you should try some spelling variations:
petris » petri (Expand Search), peteris (Expand Search), petriis (Expand Search), petruis (Expand Search)
petruv » petru (Expand Search), petrov (Expand Search), peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petrv » petrov (Expand Search), petri (Expand Search), petru (Expand Search), peterv (Expand Search), petriv (Expand Search), petruv (Expand Search)
petruis » peteruis (Expand Search), petriuis (Expand Search), petruuis (Expand Search)
petruuv » peteruuv (Expand Search), petriuuv (Expand Search), petruuuv (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petrov (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 ((((petris OR petruis) OR (petruv OR petruuv)) OR petrv) OR (petr OR (petriov OR petrv))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petris OR petruis) OR (petruv OR petruuv)) OR petrv) OR (petr OR (petriov OR petrv))) o.s.*".