Perhaps you should try some spelling variations:
peteroov » petrov (Expand Search)
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petruuiov (Expand Search)
petriooov » peteriooov (Expand Search), petriiooov (Expand Search), petruiooov (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petruuo (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (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 (((peteroov OR petriooov) OR (petruiov OR peteruiov)) OR ((petruo OR petrui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peteroov OR petriooov) OR (petruiov OR peteruiov)) OR ((petruo OR petrui) OR petr)) o.s.*".