Maonyesho with a 'y': Ku-ona = to see; Causative Ku-onya = to warn; Double causative Ku-onyesha = to show.
Maonyesho seems to be the more common spelling (both in Kenya and in Tanzania): Google returns 3,130,000 hits on Maonyesho, and 'only' 388,000 on Maonesho.
Dialectal difference, I'm guessing. Next time report it.
Typo should be "maonyesho".