Perhaps you should try some spelling variations:
petrov » petro (Expand Search), peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petruiv » petruv (Expand Search), peteruiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petrui » petru (Expand Search), peterui (Expand Search), petruui (Expand Search), petroui (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petroouo » peteroouo (Expand Search), petruoouo (Expand Search), petrooouo (Expand Search)
petr » peter (Expand Search), petru (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 ((petruiv OR peteriuv) OR (((petrov OR (petri OR petrui)) OR petroouo) OR (petr OR per))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruiv OR peteriuv) OR (((petrov OR (petri OR petrui)) OR petroouo) OR (petr OR per))) o.s.*".