tonkia (englanniksi)

root (v: (siasta) kaivaa maata)
grub (v: (siasta) kaivaa maata / to dig in search of something, as e.g. a pig does to find food)
scavenge (v: kaivella, penkoa / to search through unwanted material for useful material)
dig (v: to research a particular subject, especially a suspicious case)