"Rồng đến nhà tôm": "Dragon visits shrimp's house" - A saying used by a host to (or of) his guest: the host portrays himself as a humble shrimp and his guest as a noble dragon.
"Ăn như rồng cuốn, nói như rồng leo, làm như mèo mửa": "Eating as dragon scrolls, talking as dragon climbs, working as cat vomits" - A criticism of someone who eats too much and talks a lot, but is lazy.