Perhaps you should try some spelling variations:
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petruuiov (Expand Search)
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petruioov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petrouiov » peterouiov (Expand Search), petriouiov (Expand Search), petruouiov (Expand Search)
petruui » peteruui (Expand Search), petriuui (Expand Search), petruuui (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 ((petruov OR ((petriov OR petruiov) OR petrouiov)) OR ((petrioov OR petruui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR ((petriov OR petruiov) OR petrouiov)) OR ((petrioov OR petruui) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruov OR ((petriov OR petruiov) OR petrouiov)) OR ((petrioov OR petruui) OR petr)) o.s.*.