Perhaps you should try some spelling variations:
petrue » petre (Expand Search), pentrue (Expand Search), peterue (Expand Search), perue (Expand Search)
petra » petre (Expand Search), petera (Expand Search), pera (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), peru (Expand Search)
petro » petrov (Expand Search), petero (Expand Search), pero (Expand Search)
petr » peter (Expand Search), per (Expand Search)
petri » peteri (Expand Search), peri (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search), peters (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 ((((petrue OR (petra OR petru)) OR petro) o) OR ((petr OR ((petri OR peroi) OR peteri)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrue OR (petra OR petru)) OR petro) o) OR ((petr OR ((petri OR peroi) OR peteri)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petrue OR (petra OR petru)) OR petro) o) OR ((petr OR ((petri OR peroi) OR peteri)) _)). s.*.