Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruuuuov » peteruuuuov (Expand Search), petriuuuuov (Expand Search), petruuuuuov (Expand Search)
petruiiiuuov » peteruiiiuuov (Expand Search), petriuiiiuuov (Expand Search), petruuiiiuuov (Expand Search)
petruuiiuuov » peteruuiiuuov (Expand Search), petriuuiiuuov (Expand Search), petruuuiiuuov (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 ((petriov OR (petruuuuov OR (petruiiiuuov OR petruuiiuuov))) OR (petrio OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR (petruuuuov OR (petruiiiuuov OR petruuiiuuov))) OR (petrio OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriov OR (petruuuuov OR (petruiiiuuov OR petruuiiuuov))) OR (petrio OR petr)) o.s.*.