Perhaps you should try some spelling variations:
petriiiv » peteriiiv (Expand Search), periiiv (Expand Search)
petruuv » peteruuv (Expand Search), peruuv (Expand Search)
petro » petero (Expand Search), pero (Expand Search)
petru » peteru (Expand Search), peru (Expand Search)
petrov » peterov (Expand Search), perov (Expand Search)
petri » peteri (Expand Search), peri (Expand Search)
petruo » peteruo (Expand Search), peruo (Expand Search)
petr » peter (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 ((petriiiv OR petruuv) OR (((((petro OR petru) OR petrov) OR petri) OR petruo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiiv OR petruuv) OR (((((petro OR petru) OR petrov) OR petri) OR petruo) OR petr)) o.s.*".