Perhaps you should try some spelling variations:
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petriiiuv » peteriiiuv (Expand Search), petriiiiuv (Expand Search), petruiiiuv (Expand Search)
petriuiiuv » peteriuiiuv (Expand Search), petriiuiiuv (Expand Search), petruiuiiuv (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (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 ((petriv OR (petriiiuv OR petriuiiuv)) OR (((petroi OR petrio) OR petero) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriv OR (petriiiuv OR petriuiiuv)) OR (((petroi OR petrio) OR petero) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriv OR (petriiiuv OR petriuiiuv)) OR (((petroi OR petrio) OR petero) OR petr)) o.s.*.