Perhaps you should try some spelling variations:
petriiuv » peteriiuv (Expand Search), petriiiuv (Expand Search), petruiiuv (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petrioou » peterioou (Expand Search), petriioou (Expand Search), petruioou (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petruuo (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 (petruov OR peteriuov)) OR (((petriu OR petrioou) OR petruo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiuv OR (petruov OR peteriuov)) OR (((petriu OR petrioou) OR petruo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiuv OR (petruov OR peteriuov)) OR (((petriu OR petrioou) OR petruo) OR petr)) o.s.*.