S? ?? ??u ni h? thng m thanh phng 1000-1200 m2 .
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S? ?? ??u ni h? thng m thanh phng 800 m2 .
S? ?? ??u ni h? thng m thanh phng 500 m2 .
S? ?? ??u ni h? thng m thanh phng 300-450 m2 .
S? ?? ??u ni h? thng m thanh phng 200-300 m2 .
