Perhaps you should try some spelling variations:
petriv » petrov (Expand Search), peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petruiv » peteruiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petriio » peteriio (Expand Search), petruiio (Expand Search), petroiio (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((petriv OR petruiv) OR ((petris OR petriio) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriv OR petruiv) OR ((petris OR petriio) OR (petr OR petri))) o.s.*".