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)
petriiiv » peteriiiv (Expand Search), petruiiiv (Expand Search), petroiiiv (Expand Search)
petruuo » peteruuo (Expand Search), petruuuo (Expand Search), petrouuo (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 petriiiv) OR (((petruuo OR peteriuo) OR petero) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiv OR petriiiv) OR (((petruuo OR peteriuo) OR petero) OR (petr OR petri))) o.s.*".