Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriuiv » peteriuiv (Expand Search), petriiuiv (Expand Search), petruiuiv (Expand Search)
petruiuoi » peteruiuoi (Expand Search), petriuiuoi (Expand Search), petruuiuoi (Expand Search)
petriiuoi » peteriiuoi (Expand Search), petriiiuoi (Expand Search), petruiiuoi (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (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 (petriuiv OR petriuiv)) OR (((petruiuoi OR petriiuoi) OR petrui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR (petriuiv OR petriuiv)) OR (((petruiuoi OR petriiuoi) OR petrui) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriov OR (petriuiv OR petriuiv)) OR (((petruiuoi OR petriiuoi) OR petrui) OR petr)) o.s.*.