Perhaps you should try some spelling variations:
petriiiv » peteriiiv (Expand Search), petriiiiv (Expand Search), petruiiiv (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petruuo (Expand Search)
petriuiuo » peteriuiuo (Expand Search), petriiuiuo (Expand Search), petruiuiuo (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 ((((petriiiv OR petriiiv) OR petriuv) OR petruov) OR ((petruo OR petriuiuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriiiv OR petriiiv) OR petriuv) OR petruov) OR ((petruo OR petriuiuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriiiv OR petriiiv) OR petriuv) OR petruov) OR ((petruo OR petriuiuo) OR petr)) o.s.*.