Perhaps you should try some spelling variations:
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petruuv » pentruuv (Expand Search), peteruuv (Expand Search), petrouuv (Expand Search), peruuv (Expand Search)
petrou » petro (Expand Search), petrov (Expand Search), petrow (Expand Search), peterou (Expand Search), petroou (Expand Search), perou (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
peterov » petrov (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 ((((petru OR petrou) OR petrou) OR petruuv) OR ((petr OR (peterov OR peroov)) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petru OR petrou) OR petrou) OR petruuv) OR ((petr OR (peterov OR peroov)) OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petru OR petrou) OR petrou) OR petruuv) OR ((petr OR (peterov OR peroov)) OR petri)) o.s.*.