Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petruiuv » petruuv (Expand Search), peteruiuv (Expand Search), petruuiuv (Expand Search), petrouiuv (Expand Search)
petrui » petru (Expand Search), peterui (Expand Search), petruui (Expand Search), petroui (Expand Search)
petruuv » peteruuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (((petruuv OR peteriuuv) OR petruiuv) OR ((peterov OR petrui) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruuv OR peteriuuv) OR petruiuv) OR ((peterov OR petrui) OR (petr OR petri))) o.s.*".