Perhaps you should try some spelling variations:
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
peteruov » petrov (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petriou » peteriou (Expand Search), petriiou (Expand Search), petruiou (Expand Search)
petriiuuo » peteriiuuo (Expand Search), petriiiuuo (Expand Search), petruiiuuo (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 ((petriuov OR peteruov) OR (((petriu OR petriou) OR (petriiuuo OR peteriiuuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuov OR peteruov) OR (((petriu OR petriou) OR (petriiuuo OR peteriiuuo)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriuov OR peteruov) OR (((petriu OR petriou) OR (petriiuuo OR peteriiuuo)) OR petr)) o.s.*.