Perhaps you should try some spelling variations:
peterov » petrov (Expand Search), peterv (Expand Search), petersv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petrui » peterui (Expand Search), petruui (Expand Search), petroui (Expand Search), petru (Expand Search)
petruo » peteruo (Expand Search), petruuo (Expand Search), petrouo (Expand Search), petru (Expand Search), petro (Expand Search)
petrouo » peterouo (Expand Search), petruouo (Expand Search), petroouo (Expand Search)
petruuo » peteruuo (Expand Search), petruuuo (Expand Search), petrouuo (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petero » peter (Expand Search), peters (Expand Search), petro (Expand Search)

Try widening your search to All Fields.

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 ((((petr OR petrui) OR petero) OR ((petruo OR petrouo) OR petruuo)) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (peterov OR ((((petr OR petrui) OR petero) OR ((petruo OR petrouo) OR petruuo)) OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (peterov OR ((((petr OR petrui) OR petero) OR ((petruo OR petrouo) OR petruuo)) OR petri)) o.s.*.