Perhaps you should try some spelling variations:
petroov » peteroov (Expand Search), petrioov (Expand Search), petrooov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petrouo (Expand Search)
petrouo » peterouo (Expand Search), petriouo (Expand Search), petroouo (Expand Search)
petriouo » peteriouo (Expand Search), petriiouo (Expand Search), petroiouo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (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 ((petroov OR peterov) OR ((petru OR (petruo OR (petrouo OR petriouo))) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroov OR peterov) OR ((petru OR (petruo OR (petrouo OR petriouo))) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petroov OR peterov) OR ((petru OR (petruo OR (petrouo OR petriouo))) OR petr)) o.s.*.