Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), pentruov (Expand Search), petriov (Expand Search), petriuov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
peterov » petrov (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petruoiio » pentruoiio (Expand Search), petrioiio (Expand Search), petriuoiio (Expand Search), petrouoiio (Expand Search), peruoiio (Expand Search)
petriiuio » petriiiuio (Expand Search), petroiiuio (Expand Search), periiuio (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 (((petruov OR peterov) OR petru) OR ((petruoiio OR petriiuio) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR peterov) OR petru) OR ((petruoiio OR petriiuio) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruov OR peterov) OR petru) OR ((petruoiio OR petriiuio) OR (petr OR peter))) o.s.*.