Perhaps you should try some spelling variations:
peru » petru (Expand Search), per (Expand Search)
petriov » peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petrovu » peterovu (Expand Search), petruovu (Expand Search), petroovu (Expand Search)
petruo » peteruo (Expand Search), petruuo (Expand Search), petrouo (Expand Search)
petrouuo » peterouuo (Expand Search), petruouuo (Expand Search), petroouuo (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 ((peru OR petrovu) OR (((petruo OR petrouuo) OR petri) OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR ((peru OR petrovu) OR (((petruo OR petrouuo) OR petri) OR petr))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriov OR ((peru OR petrovu) OR (((petruo OR petrouuo) OR petri) OR petr))) o.s.*.