Perhaps you should try some spelling variations:
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petrov » peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (Expand Search)
petruuuo » peteruuuo (Expand Search), petriuuuo (Expand Search), petruuuuo (Expand Search)
petriuov » peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 peteriuiv) OR (((petrov OR (petruuo OR petruuuo)) OR petriuov) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriv OR peteriuiv) OR (((petrov OR (petruuo OR petruuuo)) OR petriuov) OR petr)) o.s.*".