Perhaps you should try some spelling variations:
peri » petri (Expand Search), per (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriuiov » peteriuiov (Expand Search), petriiuiov (Expand Search), petruiuiov (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (Expand Search)
petriiiuo » peteriiiuo (Expand Search), petriiiiuo (Expand Search), petruiiiuo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((petriov OR (peteruiov OR petriuiov)) OR (((petrio OR peri) OR petriiiuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR (peteruiov OR petriuiov)) OR (((petrio OR peri) OR petriiiuo) OR petr)) o.s.*".