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29/8/2003 - danghung - hom nay toi muon hoi ve ky thuat nuoi Hau va ngoc trai... toi moi hoi :"tai sao trong nuoi hau va ngoc trai nguoi ta thuong dat cac day nuoi va long nuoi cach day tu 50cm tro len ma khong de sat day?

Nguoi ta dat cach day de chong o nhiem do bun dat o day.