Perhaps you should try some spelling variations:
petruuov » petrov (Expand Search), peteruuov (Expand Search), petrouuov (Expand Search), peruuov (Expand Search)
peru » per (Expand Search)
petriv » peteriv (Expand Search), petroiv (Expand Search), periv (Expand Search)
petriov » peteriov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petr » peter (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 ((((petriv OR petriov) OR petruuov) OR peteruv) OR (((petru OR peru) OR petri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriv OR petriov) OR petruuov) OR peteruv) OR (((petru OR peru) OR petri) OR petr)) o.s.*".