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)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petruuiov » peteruuiov (Expand Search), petriuuiov (Expand Search), petruuuiov (Expand Search)
petruio » peteruio (Expand Search), petriuio (Expand Search), petruuio (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 ((((petriiov OR peteriiov) OR petriiv) OR (petruiov OR petruuiov)) OR (petruio OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriiov OR peteriiov) OR petriiv) OR (petruiov OR petruuiov)) OR (petruio OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriiov OR peteriiov) OR petriiv) OR (petruiov OR petruuiov)) OR (petruio OR petr)) o.s.*.