Perhaps you should try some spelling variations:
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petruioov (Expand Search)
peteroui » peterdi (Expand Search)
petruiv » peteruiv (Expand Search), petriuiv (Expand Search), petruuiv (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (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 ((petrioov OR (petruiv OR peterov)) OR (((petrui OR petriui) OR peteroui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrioov OR (petruiv OR peterov)) OR (((petrui OR petriui) OR peteroui) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrioov OR (petruiv OR peterov)) OR (((petrui OR petriui) OR peteroui) OR petr)) o.s.*.