Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
peteriio » peterdi (Expand Search)
petruiiov » peteruiiov (Expand Search), petriuiiov (Expand Search), petruuiiov (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petriuio » peteriuio (Expand Search), petriiuio (Expand Search), petruiuio (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 ((petriiov OR petruiiov) OR (((pero OR petrou) OR (petriuio OR peteriio)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiov OR petruiiov) OR (((pero OR petrou) OR (petriuio OR peteriio)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiov OR petruiiov) OR (((pero OR petrou) OR (petriuio OR peteriio)) OR petr)) o.s.*.