Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petriuuv » peteriuuv (Expand Search), petriiuuv (Expand Search), petruiuuv (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petruiio (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 petriiv) OR ((petriuv OR petriuuv) OR petriuv)) OR (petriio OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR petriiv) OR ((petriuv OR petriuuv) OR petriuv)) OR (petriio OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR petriiv) OR ((petriuv OR petriuuv) OR petriuv)) OR (petriio OR petr)) o.s.*.