Perhaps you should try some spelling variations:
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petruoi » peteruoi (Expand Search), petruuoi (Expand Search), petrouoi (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrui » peterui (Expand Search), petruui (Expand Search), petroui (Expand Search), petru (Expand Search)
petriv » peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search), petrov (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petrois » peterois (Expand Search), petruois (Expand Search), petroois (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 (petr OR ((petruoi OR (petri OR petrui)) OR (petriv OR ((petris OR petrois) OR petrois)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petr OR ((petruoi OR (petri OR petrui)) OR (petriv OR ((petris OR petrois) OR petrois)))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petr OR ((petruoi OR (petri OR petrui)) OR (petriv OR ((petris OR petrois) OR petrois)))) o.s.*.