Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
peteruov » petrov (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (Expand Search)
petruiuuo » peteruiuuo (Expand Search), petriuiuuo (Expand Search), petruuiuuo (Expand Search)
petruio » peteruio (Expand Search), petriuio (Expand Search), petruuio (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 peteriiov) OR peteruov) OR (((petruuo OR petruiuuo) OR petruio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriiov OR peteriiov) OR peteruov) OR (((petruuo OR petruiuuo) OR petruio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriiov OR peteriiov) OR peteruov) OR (((petruuo OR petruiuuo) OR petruio) OR petr)) o.s.*.