Perhaps you should try some spelling variations:
pero » petro (Expand Search), per (Expand Search), pro (Expand Search)
petrui » petru (Expand Search), peterui (Expand Search), petruui (Expand Search), petroui (Expand Search)
peterov » petrov (Expand Search)
petriiv » peteriiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petruou » peteruou (Expand Search), petruuou (Expand Search), petrouou (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((peteriv OR petriiv) OR ((((petruou OR pero) OR petrui) OR peterov) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteriv OR petriiv) OR ((((petruou OR pero) OR petrui) OR peterov) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteriv OR petriiv) OR ((((petruou OR pero) OR petrui) OR peterov) OR (petr OR petri))) o.s.*.