Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
peters » petersen (Expand Search)
petriuuo » petriiuuo (Expand Search), petroiuuo (Expand Search), periuuo (Expand Search), petriuo (Expand Search), petrisuo (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petru » petriu (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search), petri (Expand Search)
petriu » petriiu (Expand Search), petroiu (Expand Search), periu (Expand Search), petri (Expand Search), petris (Expand Search)
peris » petris (Expand Search), paris (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 ((petriuuo OR peters) OR ((petr OR (petru OR (petriu OR peris))) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR ((petriuuo OR peters) OR ((petr OR (petru OR (petriu OR peris))) OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriov OR ((petriuuo OR peters) OR ((petr OR (petru OR (petriu OR peris))) OR peter))) o.s.*.