Perhaps you should try some spelling variations:
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petriv » peteriv (Expand Search), petroiv (Expand Search), periv (Expand Search), petris (Expand Search), petrov (Expand Search)
petruuiv » peteruuiv (Expand Search), petrouuiv (Expand Search), peruuiv (Expand Search), pentruuiv (Expand Search)
petrouuiv » peterouuiv (Expand Search), petroouuiv (Expand Search), perouuiv (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
peters » peter (Expand Search), petersen (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 (petriv OR (petruuiv OR petrouuiv))) OR (peters OR (petru OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR (petriv OR (petruuiv OR petrouuiv))) OR (peters OR (petru OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR (petriv OR (petruuiv OR petrouuiv))) OR (peters OR (petru OR petri))) o.s.*.