Perhaps you should try some spelling variations:
peterv » peter (Expand Search), peters (Expand Search)
petruv » petru (Expand Search)
petrov » petro (Expand Search)
pero » petro (Expand Search), per (Expand Search), pro (Expand Search)
petero » peter (Expand Search), peters (Expand Search), petro (Expand Search)
petrou » petru (Expand Search), petro (Expand Search), petrow (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search), peters (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 ((peterv OR petruv) OR (petrov OR ((((pero OR petero) OR petrou) OR peteri) OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterv OR petruv) OR (petrov OR ((((pero OR petero) OR petrou) OR peteri) OR petri))) o.s.*".