Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriiiiiov » peteriiiiiov (Expand Search), petriiiiiiov (Expand Search), petruiiiiiov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruiiiov » peteruiiiov (Expand Search), petriuiiiov (Expand Search), petruuiiiov (Expand Search)
petriuo » peteriuo (Expand Search), petriiuo (Expand Search), petruiuo (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 ((petriov OR ((petriiiiiov OR petruov) OR petruiiiov)) OR (petriuo OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR ((petriiiiiov OR petruov) OR petruiiiov)) OR (petriuo OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriov OR ((petriiiiiov OR petruov) OR petruiiiov)) OR (petriuo OR petr)) o.s.*.