Perhaps you should try some spelling variations:
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriouov » peteriouov (Expand Search), petriiouov (Expand Search), petruiouov (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petruuo (Expand Search)
petrouo » peterouo (Expand Search), petriouo (Expand Search), petruouo (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 petriouov) OR (((petriu OR peteriu) OR (petruo OR petrouo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR petriouov) OR (((petriu OR peteriu) OR (petruo OR petrouo)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruov OR petriouov) OR (((petriu OR peteriu) OR (petruo OR petrouo)) OR petr)) o.s.*.