Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petruuiov » pentruuiov (Expand Search), petriuiov (Expand Search), petriuuiov (Expand Search), petrouuiov (Expand Search), peruuiov (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petruiou » pentruiou (Expand Search), petriiou (Expand Search), petriuiou (Expand Search), petrouiou (Expand Search), peruiou (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 petruuiov) OR ((petru OR petruiou) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR petriuv) OR petruuiov) OR ((petru OR petruiou) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR petriuv) OR petruuiov) OR ((petru OR petruiou) OR (petr OR peter))) o.s.*.