Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petrouv » petrov (Expand Search), petriouv (Expand Search), petroouv (Expand Search), perouv (Expand Search)
petruv » petrov (Expand Search), pentruv (Expand Search), petriv (Expand Search), petriuv (Expand Search), petrouv (Expand Search), peruv (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petriuv » petriiuv (Expand Search), petroiuv (Expand Search), periuv (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (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 (petriuv OR petrouv)) OR ((petruv OR petru) OR petriuv)) OR (petr OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR (petriuv OR petrouv)) OR ((petruv OR petru) OR petriuv)) OR (petr OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR (petriuv OR petrouv)) OR ((petruv OR petru) OR petriuv)) OR (petr OR peter)) o.s.*.