Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petruiv » peteruiv (Expand Search), petriuiv (Expand Search), petruuiv (Expand Search)
petruiiov » peteruiiov (Expand Search), petriuiiov (Expand Search), petruuiiov (Expand Search)
petriiuov » peteriiuov (Expand Search), petriiiuov (Expand Search), petruiiuov (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 (((((petriov OR petruv) OR petruiv) OR petruiiov) OR petriiuov) OR (peteruo OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((petriov OR petruv) OR petruiv) OR petruiiov) OR petriiuov) OR (peteruo OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((((petriov OR petruv) OR petruiv) OR petruiiov) OR petriiuov) OR (peteruo OR petr)) o.s.*.