Perhaps you should try some spelling variations:
peteriov » petrov (Expand Search)
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petruioov (Expand Search)
petriuui » peteriuui (Expand Search), petriiuui (Expand Search), petruiuui (Expand Search)
petruuui » peteruuui (Expand Search), petriuuui (Expand Search), petruuuui (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (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 ((peteriov OR peterioiov) OR (((petriuui OR petruuui) OR (petruov OR petrioov)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteriov OR peterioiov) OR (((petriuui OR petruuui) OR (petruov OR petrioov)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteriov OR peterioiov) OR (((petriuui OR petruuui) OR (petruov OR petrioov)) OR petr)) o.s.*.