Perhaps you should try some spelling variations:
petrouv » petrov (Expand Search), peterouv (Expand Search), petroouv (Expand Search), perouv (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petriouo » peteriouo (Expand Search), petroiouo (Expand Search), periouo (Expand Search)
petroiouo » peteroiouo (Expand Search), petrooiouo (Expand Search), peroiouo (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 ((petrouv OR peteruv) OR ((petru OR (petriouo OR petroiouo)) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrouv OR peteruv) OR ((petru OR (petriouo OR petroiouo)) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrouv OR peteruv) OR ((petru OR (petriouo OR petroiouo)) OR (petr OR petri))) o.s.*.