Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petriu » petri (Expand Search), petris (Expand Search), petriiu (Expand Search), petroiu (Expand Search), periu (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petruio » pentruio (Expand Search), petriio (Expand Search), petriuio (Expand Search), petrouio (Expand Search), peruio (Expand Search)
petriiio » petriiiio (Expand Search), petroiiio (Expand Search), periiio (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 (((petriu OR petru) OR (petruio OR petriiio)) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR (((petriu OR petru) OR (petruio OR petriiio)) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriov OR (((petriu OR petru) OR (petruio OR petriiio)) OR (petr OR peter))) o.s.*.