Perhaps you should try some spelling variations:
petrv » petrov (Expand Search), petru (Expand Search), petro (Expand Search), peterv (Expand Search), petruv (Expand Search)
peterov » petrov (Expand Search)
petruov » petrov (Expand Search), peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petriuo » peteriuo (Expand Search), petruiuo (Expand Search), petroiuo (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 (petrv OR ((peterov OR petruov) OR ((peteruo OR petriuo) OR (petr OR petri)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petrv OR ((peterov OR petruov) OR ((peteruo OR petriuo) OR (petr OR petri)))) o.s.*".