Perhaps you should try some spelling variations:
"fop petrov OR peru OR petrovu OR petruovvu OR petruo OR peru OR petri OR petr o.s.*" » "fop petrov OR petru OR petrovu OR petruovvu OR petruo OR petru OR petri OR petr o.s.*" (Expand Search), "fop petrov OR per OR petrovu OR petruovvu OR petruo OR per OR petri OR petr o.s.*" (Expand Search), "fop peterov OR peru OR peterovu OR peteruovvu OR peteruo OR peru OR peteri OR peter o.s.*" (Expand Search), "fop petruov OR peru OR petruovu OR petruuovvu OR petruuo OR peru OR petrui OR petru o.s.*" (Expand Search), "fop petroov OR peru OR petroovu OR petrouovvu OR petrouo OR peru OR petroi OR petro 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 ((peru OR (petrovu OR petruovvu)) OR (((petruo OR peru) OR petri) OR petr))) o.s.*.