Perhaps you should try some spelling variations:
petrouw » petrow (Expand Search), peterouw (Expand Search), petruouw (Expand Search), petroouw (Expand Search)
petroww » petrow (Expand Search), petrowna (Expand Search), peteroww (Expand Search), petruoww (Expand Search), petrooww (Expand Search)
petroow » petrow (Expand Search), peteroow (Expand Search), petruoow (Expand Search), petrooow (Expand Search)
petroou » peteroou (Expand Search), petruoou (Expand Search), petrooou (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 ((((petrouw OR (petroww OR petroow)) OR (petroou OR petri)) o) OR ((petr OR peterov) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrouw OR (petroww OR petroow)) OR (petroou OR petri)) o) OR ((petr OR peterov) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petrouw OR (petroww OR petroow)) OR (petroou OR petri)) o) OR ((petr OR peterov) _)). s.*.