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