Perhaps you should try some spelling variations:
peteriov » petrov (Expand Search)
petruuov » petrov (Expand Search), peteruuov (Expand Search), petriuuov (Expand Search), petruuuov (Expand Search)
petriuiov » peteriuiov (Expand Search), petriiuiov (Expand Search), petruiuiov (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (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 ((petriuiov OR peteriov) OR ((((petrui OR peteri) OR petroi) OR petruuov) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuiov OR peteriov) OR ((((petrui OR peteri) OR petroi) OR petruuov) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriuiov OR peteriov) OR ((((petrui OR peteri) OR petroi) OR petruuov) OR petr)) o.s.*.