Nói câu này trong Tiếng Việt như thế nào? How do you say in Vietnamese, "regulate piano action." It involves adjusting, and possibly replacing some of, the small pieces that move when you strike the key.

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It is needed periodically in order to make playing the piano smooth (for an acoustic piano, not digital). Otherwise, if you strike different keys with the same power, some sound loud and some soft or not at all. I am visiting family in Ecopark region near Hà Nội. Their piano is badly in need of regulation and I want to find a good quality person or company to work on it. But I don't know how to look it up online, because I don't know the right words. It's more involved than tuning, though the piano also needs a tuning. In English it's referred to as "regulating the action."