Perhaps you should try some spelling variations:
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petruiuiv » peteruiuiv (Expand Search), petriuiuiv (Expand Search), petruuiuiv (Expand Search)
petruuuiuiv » peteruuuiuiv (Expand Search), petriuuuiuiv (Expand Search), petruuuuiuiv (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (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 ((petriiv OR (petruiuiv OR petruuuiuiv)) OR (((petero OR petroi) OR petruuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiv OR (petruiuiv OR petruuuiuiv)) OR (((petero OR petroi) OR petruuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiv OR (petruiuiv OR petruuuiuiv)) OR (((petero OR petroi) OR petruuo) OR petr)) o.s.*.