Perhaps you should try some spelling variations:
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petruuiov (Expand Search)
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petroov » peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petrouuo » peterouuo (Expand Search), petriouuo (Expand Search), petruouuo (Expand Search)
petriuuo » peteriuuo (Expand Search), petriiuuo (Expand Search), petruiuuo (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 ((petruiov OR petriiov) OR (((petroi OR petroov) OR (petrouuo OR petriuuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruiov OR petriiov) OR (((petroi OR petroov) OR (petrouuo OR petriuuo)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruiov OR petriiov) OR (((petroi OR petroov) OR (petrouuo OR petriuuo)) OR petr)) o.s.*.