Perhaps you should try some spelling variations:
"fop petrov OR petruv OR peterov OR petrov OR petriv OR petri OR peter o.s.*" » "fop petro OR petruv OR peterov OR petro OR petriv OR petri OR peter o.s.*" (Expand Search), "fop petrov OR petru OR peterov OR petrov OR petriv OR petri OR peter o.s.*" (Expand Search), "fop petrov OR petruv OR peterov OR petrov OR petris OR petri OR peter o.s.*" (Expand Search)

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

• Removing quotes may allow a broader search: fop ((((petrov OR petruv) OR peterov) OR (petrov OR petriv)) OR (petri OR peter)) o.s.*.