Perhaps you should try some spelling variations:
petrv » peterv (Expand Search), petriv (Expand Search), petruv (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petriiiv » peteriiiv (Expand Search), petriiiiv (Expand Search), petruiiiv (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((petrv OR peteruv) OR ((petriiv OR petriiiv) OR ((petruov OR petruuo) OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrv OR peteruv) OR ((petriiv OR petriiiv) OR ((petruov OR petruuo) OR petr))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrv OR peteruv) OR ((petriiv OR petriiiv) OR ((petruov OR petruuo) OR petr))) o.s.*.