Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petruuiov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruuiiv » peteruuiiv (Expand Search), petriuuiiv (Expand Search), petruuuiiv (Expand Search)
petriuiov » peteriuiov (Expand Search), petriiuiov (Expand Search), petruiuiov (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 petriiov) OR petruuiiv) OR (petruiov OR petriuiov)) OR (petrio OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriov OR petriiov) OR petruuiiv) OR (petruiov OR petriuiov)) OR (petrio OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriov OR petriiov) OR petruuiiv) OR (petruiov OR petriuiov)) OR (petrio OR petr)) o.s.*.