Perhaps you should try some spelling variations:
petrioov » petrov (Expand Search), peterioov (Expand Search), petruioov (Expand Search), petroioov (Expand Search)
petroov » peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petruiu » peteruiu (Expand Search), petruuiu (Expand Search), petrouiu (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruo » peteruo (Expand Search), petruuo (Expand Search), petrouo (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 ((petroov OR (petroov OR petrioov)) OR (petruiu OR ((petri OR petruo) OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroov OR (petroov OR petrioov)) OR (petruiu OR ((petri OR petruo) OR petr))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petroov OR (petroov OR petrioov)) OR (petruiu OR ((petri OR petruo) OR petr))) o.s.*.