Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petruov » petrov (Expand Search), petruv (Expand Search), petruuov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petruo » petru (Expand Search), petro (Expand Search), petruuo (Expand Search), petrouo (Expand Search), peruo (Expand Search)
petruuo » petruuuo (Expand Search), petrouuo (Expand Search), peruuo (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (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 ((peterov OR petruov) OR (((petruo OR petruuo) OR peter) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR petruov) OR (((petruo OR petruuo) OR peter) OR (petr OR petri))) o.s.*".