Perhaps you should try some spelling variations:
petruouv » petrov (Expand Search), peteruouv (Expand Search), petruuouv (Expand Search), petrououv (Expand Search)
peru » petru (Expand Search), per (Expand Search)
petrouv » peterouv (Expand Search), petruouv (Expand Search), petroouv (Expand Search)
petruuv » peteruuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruo » peteruo (Expand Search), petruuo (Expand Search), petrouo (Expand Search)
petr » peter (Expand Search), petru (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 (((petrouv OR petruouv) OR petruuv) OR ((((petri OR peteri) OR peru) OR petruo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrouv OR petruouv) OR petruuv) OR ((((petri OR peteri) OR peru) OR petruo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petrouv OR petruouv) OR petruuv) OR ((((petri OR peteri) OR peru) OR petruo) OR petr)) o.s.*.