Perhaps you should try some spelling variations:
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petruiiv » peteruiiv (Expand Search), petriuiiv (Expand Search), petruuiiv (Expand Search)
petruiiiv » peteruiiiv (Expand Search), petriuiiiv (Expand Search), petruuiiiv (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petruiu » peteruiu (Expand Search), petriuiu (Expand Search), petruuiu (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 ((peteruv OR ((petriiv OR petruiiv) OR petruiiiv)) OR ((petriu OR petruiu) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteruv OR ((petriiv OR petruiiv) OR petruiiiv)) OR ((petriu OR petruiu) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteruv OR ((petriiv OR petruiiv) OR petruiiiv)) OR ((petriu OR petruiu) OR petr)) o.s.*.