Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petroiiov (Expand Search)
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petrouiov (Expand Search)
petriiiov » peteriiiov (Expand Search), petriiiiov (Expand Search), petroiiiov (Expand Search)
petriiuov » peteriiuov (Expand Search), petriiiuov (Expand Search), petroiiuov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petroiv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (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 petriiiov) OR petriiuov) OR (petruiov OR petriv)) OR (petru OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriiov OR petriiiov) OR petriiuov) OR (petruiov OR petriv)) OR (petru OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriiov OR petriiiov) OR petriiuov) OR (petruiov OR petriv)) OR (petru OR petr)) o.s.*.