Perhaps you should try some spelling variations:
peters » petersen (Expand Search)
petruo » petru (Expand Search), petro (Expand Search), petruuo (Expand Search), petrouo (Expand Search), peruo (Expand Search)
peteriv » peterdiv (Expand Search)
peteri » peterdi (Expand Search)
petruio » petruuio (Expand Search), petrouio (Expand Search), peruio (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (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 (peteriv OR ((((peters OR petruo) OR (peteri OR peter)) OR petruio) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (peteriv OR ((((peters OR petruo) OR (peteri OR peter)) OR petruio) OR (petr OR petri))) o.s.*".