Perhaps you should try some spelling variations:
petero » peters (Expand Search), petro (Expand Search)
peterov » petersv (Expand Search), petrov (Expand Search)
petrov » petro (Expand Search), petruov (Expand Search), petroov (Expand Search), perov (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petrou » petruou (Expand Search), petroou (Expand Search), perou (Expand Search), petru (Expand Search), petro (Expand Search), petrow (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 (peteruv OR ((petero OR (petrov OR peterov)) OR (((petr OR petrou) OR peter) OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (peteruv OR ((petero OR (petrov OR peterov)) OR (((petr OR petrou) OR peter) OR petri))) o.s.*".