Perhaps you should try some spelling variations:
petriooov » peteriooov (Expand Search), petriiooov (Expand Search), petroiooov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petroiv (Expand Search)
petroiv » peteroiv (Expand Search), petrioiv (Expand Search), petrooiv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petrooiuo » peterooiuo (Expand Search), petriooiuo (Expand Search), petroooiuo (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 ((petriooov OR (petriv OR petroiv)) OR (((petru OR peteru) OR petrooiuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriooov OR (petriv OR petroiv)) OR (((petru OR peteru) OR petrooiuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriooov OR (petriv OR petroiv)) OR (((petru OR peteru) OR petrooiuo) OR petr)) o.s.*.