Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petruiou » peteruiou (Expand Search), petriuiou (Expand Search), petruuiou (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (Expand Search)
petriiui » peteriiui (Expand Search), petriiiui (Expand Search), petruiiui (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 ((peterov OR petriov) OR (((petrou OR petruiou) OR (petriui OR petriiui)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR petriov) OR (((petrou OR petruiou) OR (petriui OR petriiui)) OR petr)) o.s.*".