Perhaps you should try some spelling variations:
petriuov » petrov (Expand Search), peteriuov (Expand Search), petruiuov (Expand Search), petroiuov (Expand Search)
petrooov » petrov (Expand Search), peterooov (Expand Search), petruooov (Expand Search), petroooov (Expand Search)
petroioov » peteroioov (Expand Search), petruoioov (Expand Search), petrooioov (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 ((petriuov OR (petrooov OR petroioov)) OR (petruiu OR ((petri OR petruo) OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuov OR (petrooov OR petroioov)) OR (petruiu OR ((petri OR petruo) OR petr))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriuov OR (petrooov OR petroioov)) OR (petruiu OR ((petri OR petruo) OR petr))) o.s.*.