Perhaps you should try some spelling variations:
petrooov » petrov (Expand Search), petrovoov (Expand Search), petruoov (Expand Search), peterooov (Expand Search), petruooov (Expand Search), perooov (Expand Search)
petrovuv » petrov (Expand Search), petrovvuv (Expand Search), petruvuv (Expand Search), peterovuv (Expand Search), petruovuv (Expand Search), perovuv (Expand Search)
petro » petrov (Expand Search), petru (Expand Search), petero (Expand Search), petruo (Expand Search), pero (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), peri (Expand Search)
petr » peter (Expand Search), petru (Expand Search), per (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 ((petrooov OR ((petrooov OR petrovuv) OR peterv)) OR (petri OR (petro OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrooov OR ((petrooov OR petrovuv) OR peterv)) OR (petri OR (petro OR petr))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrooov OR ((petrooov OR petrovuv) OR peterv)) OR (petri OR (petro OR petr))) o.s.*.