Perhaps you should try some spelling variations:
petruow » petrow (Expand Search), peteruow (Expand Search), petruuow (Expand Search), peruow (Expand Search)
petrw » petrow (Expand Search), petru (Expand Search), petra (Expand Search), peterw (Expand Search), petruw (Expand Search), perw (Expand Search)
petr » peter (Expand Search), petru (Expand Search), per (Expand Search)
petro » petero (Expand Search), petruo (Expand Search), pero (Expand Search), petrov (Expand Search), petru (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), peri (Expand Search)
pero » per (Expand Search), pro (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((((petruow OR peteruuow) OR (petrw OR (petr OR petro))) o) OR ((pero OR petri) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruow OR peteruuow) OR (petrw OR (petr OR petro))) o) OR ((pero OR petri) _)). s.*".