Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petruiuo » pentruiuo (Expand Search), peteruiuo (Expand Search), petrouiuo (Expand Search), peruiuo (Expand Search)
petris » peteris (Expand Search), petrois (Expand Search), peris (Expand Search)
petroiuo » peteroiuo (Expand Search), petrooiuo (Expand Search), peroiuo (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (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 ((petris OR peterov) OR ((petru OR (petroiuo OR petruiuo)) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petris OR peterov) OR ((petru OR (petroiuo OR petruiuo)) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petris OR peterov) OR ((petru OR (petroiuo OR petruiuo)) OR (petr OR petri))) o.s.*.