Perhaps you should try some spelling variations:
peteriov » petrov (Expand Search)
periov » petriov (Expand Search), perov (Expand Search)
peri » petri (Expand Search), per (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petrouov (Expand Search)
petroov » peteroov (Expand Search), petrioov (Expand Search), petrooov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petr » peter (Expand Search), petri (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 ((((petruov OR petroov) OR (peteriov OR periov)) OR peruv) OR ((petru OR peri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruov OR petroov) OR (peteriov OR periov)) OR peruv) OR ((petru OR peri) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruov OR petroov) OR (peteriov OR periov)) OR peruv) OR ((petru OR peri) OR petr)) o.s.*.