Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petrv » petrov (Expand Search), petru (Expand Search), petro (Expand Search), peterv (Expand Search), petruv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petruuo » peteruuo (Expand Search), petruuuo (Expand Search), petrouuo (Expand Search)
petroio » peteroio (Expand Search), petruoio (Expand Search), petrooio (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 ((peterov OR petrv) OR (((petr OR petruuo) OR (petroio OR peterdi)) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR petrv) OR (((petr OR petruuo) OR (petroio OR peterdi)) OR petri)) o.s.*".