Perhaps you should try some spelling variations:
petroov » petrovov (Expand Search), petriov (Expand Search), petruov (Expand Search), peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petro » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petero (Expand Search), petrio (Expand Search), petruo (Expand Search)
peri » petri (Expand Search), per (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petriuo » peteriuo (Expand Search), petriiuo (Expand Search), petruiuo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((peterov OR petroov) OR (petriu OR (((petro OR petriuo) OR peri) OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR petroov) OR (petriu OR (((petro OR petriuo) OR peri) OR petr))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peterov OR petroov) OR (petriu OR (((petro OR petriuo) OR peri) OR petr))) o.s.*.