Perhaps you should try some spelling variations:
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
petrouuuov » peterouuuov (Expand Search), petriouuuov (Expand Search), petruouuuov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petroui » peteroui (Expand Search), petrioui (Expand Search), petruoui (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 ((((petriuov OR petrouuuov) OR peterov) OR petriv) OR ((petrui OR petroui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriuov OR petrouuuov) OR peterov) OR petriv) OR ((petrui OR petroui) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriuov OR petrouuuov) OR peterov) OR petriv) OR ((petrui OR petroui) OR petr)) o.s.*.