Perhaps you should try some spelling variations:
petriv » petrov (Expand Search), peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petrio » petro (Expand Search), peterio (Expand Search), petruio (Expand Search), petroio (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petrou » peterou (Expand Search), petruou (Expand Search), petroou (Expand Search), petru (Expand Search), petro (Expand Search), petrov (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 petris) OR ((peteriu OR petrio) OR (petr OR (petrou OR petri)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriv OR petris) OR ((peteriu OR petrio) OR (petr OR (petrou OR petri)))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriv OR petris) OR ((peteriu OR petrio) OR (petr OR (petrou OR petri)))) o.s.*.