Perhaps you should try some spelling variations:
petriw » petri (Expand Search), petris (Expand Search), petrow (Expand Search)
petriov » petrov (Expand Search)
petro » petrov (Expand Search), petri (Expand Search), petr (Expand Search)
petruuiw » pentruuiw (Expand Search), petriuiw (Expand Search)
petru » pentru (Expand Search), petri (Expand Search)
peteru » peter (Expand Search), peters (Expand Search)
petriv » petri (Expand Search), petris (Expand Search), 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 ((((petriw OR petruuiw) OR (petriov OR petro)) o) OR (((petru OR peteru) OR petriv) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriw OR petruuiw) OR (petriov OR petro)) o) OR (((petru OR peteru) OR petriv) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriw OR petruuiw) OR (petriov OR petro)) o) OR (((petru OR peteru) OR petriv) _)). s.*.