Perhaps you should try some spelling variations:
petrouv » petrov (Expand Search), peterouv (Expand Search), petruouv (Expand Search), petroouv (Expand Search)
peterov » petrov (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petruo » peteruo (Expand Search), petruuo (Expand Search), petrouo (Expand Search), petru (Expand Search), petro (Expand Search)
petruuo » peteruuo (Expand Search), petruuuo (Expand Search), petrouuo (Expand Search)
petrouuo » peterouuo (Expand Search), petruouuo (Expand Search), petroouuo (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((petrouv OR peterov) OR ((petr OR (petruo OR (petruuo OR petrouuo))) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrouv OR peterov) OR ((petr OR (petruo OR (petruuo OR petrouuo))) OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrouv OR peterov) OR ((petr OR (petruo OR (petruuo OR petrouuo))) OR petri)) o.s.*.