Perhaps you should try some spelling variations:
peru » petru (Expand Search), per (Expand Search)
petriiuv » peteriiuv (Expand Search), petriiiuv (Expand Search), petruiiuv (Expand Search)
petrioiuv » peterioiuv (Expand Search), petriioiuv (Expand Search), petruioiuv (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petruiio (Expand Search)
petruiio » peteruiio (Expand Search), petriuiio (Expand Search), petruuiio (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 ((petriiuv OR petrioiuv) OR (((petriio OR petruiio) OR (peteru OR peru)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiuv OR petrioiuv) OR (((petriio OR petruiio) OR (peteru OR peru)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiuv OR petrioiuv) OR (((petriio OR petruiio) OR (peteru OR peru)) OR petr)) o.s.*.