Perhaps you should try some spelling variations:
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petroiuov (Expand Search)
petriuuuov » peteriuuuov (Expand Search), petriiuuuov (Expand Search), petroiuuuov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petroiu (Expand Search)
petroui » peteroui (Expand Search), petrioui (Expand Search), petrooui (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petroiv (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 ((petriuov OR petriuuuov) OR ((((petru OR petriu) OR petroui) OR petriv) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuov OR petriuuuov) OR ((((petru OR petriu) OR petroui) OR petriv) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriuov OR petriuuuov) OR ((((petru OR petriu) OR petroui) OR petriv) OR petr)) o.s.*.