Perhaps you should try some spelling variations:
petriv » petris (Expand Search), peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petruv » petru (Expand Search), peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petrov » petro (Expand Search), peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petrou » petru (Expand Search), petro (Expand Search), petrow (Expand Search), peterou (Expand Search), petruou (Expand Search), petroou (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 (petruv OR petrov)) OR ((petrou OR petr) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriv OR (petruv OR petrov)) OR ((petrou OR petr) OR petri)) o.s.*".