Perhaps you should try some spelling variations:
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
peteriiv » peterdi (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (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 petriuov)) OR peteruv) OR (petriiv OR peteriiv)) OR petr) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriov OR (petruov OR petriuov)) OR peteruv) OR (petriiv OR peteriiv)) OR petr) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriov OR (petruov OR petriuov)) OR peteruv) OR (petriiv OR peteriiv)) OR petr) o.s.*.