Perhaps you should try some spelling variations:
"fop perov OR petruv OR petruov OR petri OR petru OR peteri OR petero OR petr o.s.*" » "fop petrov OR petruv OR petruov OR petri OR petru OR peteri OR petero OR petr o.s.*" (Expand Search), "fop perov OR peteruv OR peteruov OR peteri OR peteru OR peteri OR petero OR peter o.s.*" (Expand Search), "fop perov OR petrouv OR petrouov OR petroi OR petrou OR peteri OR petero OR petro o.s.*" (Expand Search), "fop perov OR peruv OR peruov OR peri OR peru OR peteri OR petero OR per 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 (((perov OR petruv) OR petruov) OR ((((petri OR petru) OR peteri) OR petero) OR petr)) o.s.*.