Perhaps you should try some spelling variations:
petrooiv » petrov (Expand Search), peterooiv (Expand Search), petriooiv (Expand Search), petruooiv (Expand Search)
petriooiv » peteriooiv (Expand Search), petriiooiv (Expand Search), petruiooiv (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petruuiui » peteruuiui (Expand Search), petriuuiui (Expand Search), petruuuiui (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 (((petrooiv OR petriooiv) OR peterooiv) OR (((petruov OR petroi) OR petruuiui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrooiv OR petriooiv) OR peterooiv) OR (((petruov OR petroi) OR petruuiui) OR petr)) o.s.*".