Lawyer here. I would only be concerned as a business owner if they are targeting U.S. consumers (i.e., your market) and taking business away from you. One thing you should do is check the U.S. Trademark Office (USPTO) and see if their business name is registered in the U.S. If they are, then you may want to initiate a claim against them. If not registered and you believe they are providing products / services to U.S. consumers, you may want to send a very strongly worded cease and desist letter for nefarious (i.e., intentional) infringement. See samples on the internet. But as many have said already, it's very difficult to enforce your trademark on Chinese companies unless they have registered through the USPTO.
Good luck!
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