Perhaps you should try some spelling variations:
petruuov » petrov (Expand Search), peteruuov (Expand Search), petriuuov (Expand Search), petruuuov (Expand Search)
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petriouv » petrov (Expand Search), peteriouv (Expand Search), petriiouv (Expand Search), petruiouv (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petriouo » peteriouo (Expand Search), petriiouo (Expand Search), petruiouo (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 petriiov) OR (petruv OR petriouv)) OR ((petriouo OR petroi) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruuov OR petriiov) OR (petruv OR petriouv)) OR ((petriouo OR petroi) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruuov OR petriiov) OR (petruv OR petriouv)) OR ((petriouo OR petroi) OR petr)) o.s.*.