Perhaps you should try some spelling variations:
peri » petri (Expand Search), per (Expand Search)
petruuv » peteruuv (Expand Search), petriuuv (Expand Search), petruuuv (Expand Search)
petruuuiiov » peteruuuiiov (Expand Search), petriuuuiiov (Expand Search), petruuuuiiov (Expand Search)
petrouuiiov » peterouuiiov (Expand Search), petriouuiiov (Expand Search), petruouuiiov (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((petruuv OR (petruuuiiov OR petrouuiiov)) OR (((petriu OR petero) OR peri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruuv OR (petruuuiiov OR petrouuiiov)) OR (((petriu OR petero) OR peri) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruuv OR (petruuuiiov OR petrouuiiov)) OR (((petriu OR petero) OR peri) OR petr)) o.s.*.