lầu (“multistory building”) + xanh (“grue”), calque of Chinese 青樓 / 青楼 (thanh lâu). Wiktionary, the free dictionary
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: Unique to this establishment, small parcels of green rice or com-infused meatballs are often added to the broth, providing a chewy texture and a gentle sweetness that balances savory elements. Culinary Philosophy and Atmosphere lau xanh com
In the digital age, the keyword gained notoriety through the website , which functioned as a massive community forum and content repository for adult material in Vietnam. Lauxanh us com lầu (“multistory building”) + xanh (“grue”)