Perhaps you should try some spelling variations:
peterv » peter (Expand Search), peters (Expand Search)
petriiiv » peteriiiv (Expand Search), petruiiiv (Expand Search), petroiiiv (Expand Search)
petruiiv » peteruiiv (Expand Search), petruuiiv (Expand Search), petrouiiv (Expand Search)
petroio » peteroio (Expand Search), petruoio (Expand Search), petrooio (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 ((((petriiiv OR peteriiiv) OR petruiiv) OR peterv) OR (petroio OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriiiv OR peteriiiv) OR petruiiv) OR peterv) OR (petroio OR (petr OR petri))) o.s.*".