Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
peteriov » petrov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petruuiv » peteruuiv (Expand Search), petriuuiv (Expand Search), petruuuiv (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 peteriov) OR petruov) OR (petriv OR peteruv)) OR petruuiv) OR petr) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((petriiov OR peteriov) OR petruov) OR (petriv OR peteruv)) OR petruuiv) OR petr) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((((petriiov OR peteriov) OR petruov) OR (petriv OR peteruv)) OR petruuiv) OR petr) o.s.*.