Perhaps you should try some spelling variations:
periov » petriov (Expand Search), perov (Expand Search)
peri » petri (Expand Search), per (Expand Search)
peru » petru (Expand Search), per (Expand Search)
petriiuov » peteriiuov (Expand Search), petriiiuov (Expand Search), petruiiuov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (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 ((petriiuov OR (petriov OR (periov OR petriov))) OR (((peri OR petrou) OR peru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiuov OR (petriov OR (periov OR petriov))) OR (((peri OR petrou) OR peru) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiuov OR (petriov OR (periov OR petriov))) OR (((peri OR petrou) OR peru) OR petr)) o.s.*.