Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriiuov » peteriiuov (Expand Search), petriiiuov (Expand Search), petruiiuov (Expand Search)
petruou » peteruou (Expand Search), petriuou (Expand Search), petruuou (Expand Search)
petriiuo » peteriiuo (Expand Search), petriiiuo (Expand Search), petruiiuo (Expand Search)
petruiuo » peteruiuo (Expand Search), petriuiuo (Expand Search), petruuiuo (Expand Search)
petrioouuo » peterioouuo (Expand Search), petriioouuo (Expand Search), petruioouuo (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 ((petriov OR petriiuov) OR ((petruou OR ((petriiuo OR petruiuo) OR petrioouuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petriiuov) OR ((petruou OR ((petriiuo OR petruiuo) OR petrioouuo)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriov OR petriiuov) OR ((petruou OR ((petriiuo OR petruiuo) OR petrioouuo)) OR petr)) o.s.*.