Perhaps you should try some spelling variations:
petroow » petrow (Expand Search), peteroow (Expand Search), petruoow (Expand Search), petrooow (Expand Search)
petruw » petru (Expand Search), petrow (Expand Search), peteruw (Expand Search), petruuw (Expand Search), petrouw (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruo » peteruo (Expand Search), petruuo (Expand Search), petrouo (Expand Search), petru (Expand Search), petro (Expand Search)
petroui » peteroui (Expand Search), petruoui (Expand Search), petrooui (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 ((((petroow OR petruw) OR (petr OR petri)) o) OR ((petruo OR (petroui OR peterdi)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petroow OR petruw) OR (petr OR petri)) o) OR ((petruo OR (petroui OR peterdi)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petroow OR petruw) OR (petr OR petri)) o) OR ((petruo OR (petroui OR peterdi)) _)). s.*.