Nồi đồng nấu ốc, nồi đất nấu ếch.

More tongue twisters — Tricky

• גנן גידל דגן בגן, דגן גדול גדל בגן. (Ganan gidel dagan bagan, dagan gadol gadal bagan.) A 'g / d / n' reshuffle — the same three consonants rearrange in every word.
• ยักษ์ใหญ่ไล่ยักษ์เล็ก (Yák yài lâi yák lék) A tonal 'yak / yai / lai / lek' drill that hops across Thai tones in four short beats.
• Betty Botter bought some butter, but she said the butter's bitter. A 'b / t / tt' plosive drill that bounces between Betty, butter, and bitter.
• Бабин біб розцвів у дощ, буде бабі біб у борщ. (Babyn bib roztsviv u doshch, bude babi bib u borshch.) A bilabial 'b / bib / bor' drill that ends in a very Slavic splash of borscht.
• She sells seashells by the seashore. The definitive 's' versus 'sh' alternation — the tongue has to switch place of articulati…
• Peter Piper picked a peck of pickled peppers. A relentless 'p' plosive drill; a peck is an old dry measure of about nine litres.