Perhaps you should try some spelling variations:
petrv » petrov (Expand Search), petro (Expand Search), petra (Expand Search), peterv (Expand Search), perv (Expand Search)
peterv » peter (Expand Search), peters (Expand Search)
peterov » petrov (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petruov » pentruov (Expand Search), petrov (Expand Search), peteruov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petroov » petrov (Expand Search), peteroov (Expand Search), petrooov (Expand Search), peroov (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (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 ((((petrv OR peterv) OR (((peterov OR petru) OR petroov) OR petruov)) OR petr) OR petri) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrv OR peterv) OR (((peterov OR petru) OR petroov) OR petruov)) OR petr) OR petri) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petrv OR peterv) OR (((peterov OR petru) OR petroov) OR petruov)) OR petr) OR petri) o.s.*.