Perhaps you should try some spelling variations:
petero » peter (Expand Search), peters (Expand Search), petro (Expand Search)
petriiv » peteriiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petruiv » peteruiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petroiuiv » peteroiuiv (Expand Search), petruoiuiv (Expand Search), petrooiuiv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((petriiv OR (petruiv OR petroiuiv)) OR ((peteruuov OR petero) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiv OR (petruiv OR petroiuiv)) OR ((peteruuov OR petero) OR (petr OR petri))) o.s.*".