Perhaps you should try some spelling variations:
petriv » peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruuv » peteruuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petrov » peterov (Expand Search), petruov (Expand Search), petroov (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 ((((petriv OR petris) OR petri) OR petruuv) OR (petr OR (petrov OR petruuv))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriv OR petris) OR petri) OR petruuv) OR (petr OR (petrov OR petruuv))) o.s.*".