Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruuiiov » peteruuiiov (Expand Search), petriuuiiov (Expand Search), petruuuiiov (Expand Search)
petruioov » peteruioov (Expand Search), petriuioov (Expand Search), petruuioov (Expand Search)
petruou » peteruou (Expand Search), petriuou (Expand Search), petruuou (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 petruov) OR (petriiov OR petruuiiov)) OR petruioov) OR (petruou OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriov OR petruov) OR (petriiov OR petruuiiov)) OR petruioov) OR (petruou OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriov OR petruov) OR (petriiov OR petruuiiov)) OR petruioov) OR (petruou OR petr)) o.s.*.