Perhaps you should try some spelling variations:
petriuw » peteriuw (Expand Search), petriiuw (Expand Search), petruiuw (Expand Search)
petruuuw » peteruuuw (Expand Search), petriuuuw (Expand Search), petruuuuw (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petro » petero (Expand Search), petrio (Expand Search), petruo (Expand Search), petrov (Expand Search), petri (Expand Search), petru (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (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 ((((petriuw OR petruuuw) OR petr) o) OR ((((petro OR petriiv) OR peteru) OR petrui) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriuw OR petruuuw) OR petr) o) OR ((((petro OR petriiv) OR peteru) OR petrui) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriuw OR petruuuw) OR petr) o) OR ((((petro OR petriiv) OR peteru) OR petrui) _)). s.*.