Perhaps you should try some spelling variations:
peteruov » petrov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruiu » peteruiu (Expand Search), petriuiu (Expand Search), petruuiu (Expand Search)
petriiu » peteriiu (Expand Search), petriiiu (Expand Search), petruiiu (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (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 ((peteruov OR (petriov OR petruov)) OR ((petruiu OR petriiu) OR (petrio OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteruov OR (petriov OR petruov)) OR ((petruiu OR petriiu) OR (petrio OR petr))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteruov OR (petriov OR petruov)) OR ((petruiu OR petriiu) OR (petrio OR petr))) o.s.*.