Perhaps you should try some spelling variations:
peteriiv » peterdi (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petruiio (Expand Search)
petriiio » peteriiio (Expand Search), petriiiio (Expand Search), petruiiio (Expand Search)
petriiiio » peteriiiio (Expand Search), petriiiiio (Expand Search), petruiiiio (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 peteriiv) OR ((petero OR (petriio OR (petriiio OR petriiiio))) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiv OR peteriiv) OR ((petero OR (petriio OR (petriiio OR petriiiio))) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiv OR peteriiv) OR ((petero OR (petriio OR (petriiio OR petriiiio))) OR petr)) o.s.*.