Perhaps you should try some spelling variations:
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petrov » peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (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 (((petriuv OR petrov) OR petruv) OR ((((petruo OR pero) OR peteri) OR petrui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriuv OR petrov) OR petruv) OR ((((petruo OR pero) OR peteri) OR petrui) OR petr)) o.s.*".