Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petrv » peterv (Expand Search), petriv (Expand Search), petruv (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (Expand Search)
petruiiuo » peteruiiuo (Expand Search), petriuiiuo (Expand Search), petruuiiuo (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 ((petriiov OR ((petrv OR petriiv) OR petriiv)) OR ((petruuo OR petruiiuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiov OR ((petrv OR petriiv) OR petriiv)) OR ((petruuo OR petruiiuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiov OR ((petrv OR petriiv) OR petriiv)) OR ((petruuo OR petruiiuo) OR petr)) o.s.*.