Perhaps you should try some spelling variations:
petruuov » petrov (Expand Search), peteruuov (Expand Search), petruuuov (Expand Search), petrouuov (Expand Search)
peteriov » petrov (Expand Search)
petruuv » peteruuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petrouv » peterouv (Expand Search), petruouv (Expand Search), petroouv (Expand Search)
petruouo » peteruouo (Expand Search), petruuouo (Expand Search), petrououo (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (((petruuov OR peteriov) OR (petruuv OR petrouv)) OR ((petruouo OR petri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruuov OR peteriov) OR (petruuv OR petrouv)) OR ((petruouo OR petri) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruuov OR peteriov) OR (petruuv OR petrouv)) OR ((petruouo OR petri) OR petr)) o.s.*.