Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petruiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petriu » petru (Expand Search), petris (Expand Search), petruiu (Expand Search), petroiu (Expand Search), periu (Expand Search)
petruou » petruuou (Expand Search), petrouou (Expand Search), peruou (Expand Search)
petrouou » petruouou (Expand Search), petroouou (Expand Search), perouou (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petr » petru (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 (((petruou OR petrouou) OR (petriu OR petri)) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR (((petruou OR petrouou) OR (petriu OR petri)) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriov OR (((petruou OR petrouou) OR (petriu OR petri)) OR (petr OR peter))) o.s.*.