Perhaps you should try some spelling variations:
"fop petroov OR petroov OR peteru OR peters OR petr OR petri o.s.*" » "fop petrov OR petrov OR peteru OR peters OR petr OR petri o.s.*" (Expand Search), "fop petroov OR petroov OR peter OR peters OR petr OR petri o.s.*" (Expand Search), "fop petroov OR petroov OR petru OR peters OR petr OR petri o.s.*" (Expand Search), "fop petroov OR petroov OR peteru OR peter OR petr OR petri o.s.*" (Expand Search), "fop petroov OR petroov OR peteru OR petersen OR petr OR petri o.s.*" (Expand Search), "fop peteroov OR peteroov OR peteru OR peters OR peter OR peteri o.s.*" (Expand Search), "fop petruoov OR petruoov OR peteru OR peters OR petru OR petrui o.s.*" (Expand Search), "fop petrooov OR petrooov OR peteru OR peters OR petro OR petroi 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 ((petroov OR petroov) OR ((peteru OR peters) OR (petr OR petri))) o.s.*.